I have a 07 classic 2500HD and tow a FSC32 weekend warrior. I changed out the factory hitch to a class 5 tow beast, also installed a weight dist. hitch and sway control. I recently put a 6" lift and 35" tires and noticed no difference in the towing of it. The E rated tires has a max 65lbs. of pressure and when I put 65lbs. in the rear tires I noticed on my way home the trailer was swaying more than before. Does the tire pressure have anything to do with the sway or could it be somehting else????

you were just probably noticing it more cause if the psi in the tire the lift is more likley the culpert

Most if not all E rated tires max pressure is 80 psi. Also, if your trailer is nose high, it will sway more.

Get the proper drop hitch height so the trailer is perfectly level. That should solve most of your problems.

Get the proper drop hitch height so the trailer is perfectly level. That should solve most of your problems.
And get "E" rated tires.:rolleyes:

the taller the sidewalls the more the sway. If the tread is wider then the rim the sidewalls are at an angle, this makes sway worse yet. these + a trailer and you can feel it. just the tires you may not.

I use a swaybar on my 26ft. trailer and works great.
http://www.dieselplace.com/forum/attachment.php?attachmentid=78394&stc=1&d=1231291718

How much tongue weight do you have? Besides having the trailer level (propper hitch drop) if there's too much weight in the rear - light in the front she'll sway. If it's real bad it'll flat out take off on you once you hit critical speed!!! You might want to take a trip to the scales and weight each truck axle empty then hook up weight each truck axle and the trailer. Tongue weight should be 10% of the total trailer weight.

His post says he has "E" rated tires, it also says he has a swat control also. I would think you should that trailer is level, also, tongue weight. I have "E" rated tires that call for 65psi max, I air them to 70 psi. All the above should help your situation. It can also just be that you have larger tires too. Larger tires have more sidewall heighth and they have more flex.

I met a guy a few months ago, he lost his trailer and totalled the truck. It had a bent frame. He was comming down Cajon Pass at 45MPH(so he says) F150 SB, 21" TH and a Rhino inside. He said the trailer was swaying really bad at 45? and all of a sudden the trailer flipped on it's side lifting the rear of the truck off the ground and now no breaking what soever. I'm pretty sure he had the Rhino forwards towards the back of the trailer making the front too light. It should have been all the way up front with the rear of the Rhino in front of the second axle. More tounge weight is better. OH Ya, he dumped his fresh water too. Bad idea on a TT. Lower center of Gravity.

My "E" tires BFG, All Terrain's are rated at 80PSI. I run 70 in each dual, 50 in front when towing.

His post says he has "E" rated tires, it also says he has a swat control also. I would think you should that trailer is level, also, tongue weight. I have "E" rated tires that call for 65psi max, I air them to 70 psi. All the above should help your situation. It can also just be that you have larger tires too. Larger tires have more sidewall heighth and they have more flex.

Got of pic of the LR E and 65 psi max on the same tire?

Got of pic of the LR E and 65 psi max on the same tire?



You can go to BFG'S website and look them up. I have 305/65/17 E KM2'S. max load rating 3000@65psi. I wish they had a higher rating, but they don't. At least not in that tire that size.

Very interesting, I would not have expected a well known tire manufacturer such as BFG to have deviated from the industry standards.

You can go to BFG'S website and look them up. I have 305/65/17 E KM2'S. max load rating 3000@65psi. I wish they had a higher rating, but they don't. At least not in that tire that size.
I read it as 3195lbs @ 65 psi, and I, too, am surprised to see a LrE tire with a 65 psi max.

His post says he has "E" rated tires, it also says he has a swat control also. I would think you should that trailer is level, also, tongue weight. I have "E" rated tires that call for 65psi max, I air them to 70 psi. All the above should help your situation. It can also just be that you have larger tires too. Larger tires have more sidewall heighth and they have more flex.

My TT has a Manufacturer's sticker on the outside recommending to air the tires to 80psi, in which I did. After traveling about 800 miles on a trip last summer, I noticed one tire starting to seperate in the center. Swapped it out with the spare to continue my journey home, but stupid me only then noticed that the tires were only Load Range D with a max pressure of 65! Be cautious of over-inflating tires! BTW that's the first time I've seen Load Range E's rated for only 65psi, that's wierd that they did that. I agree with the larger tires and keep in mind the ply ratings too.

I think my Toyo's have a rating of more than 3400lbs.I dont know what size wheels you have,but I noticed a big difference when I went to an 18" wheel as opposed to my 315's on 16's.It is alot less wiggly towing with the 18's.

My TT has a Manufacturer's sticker on the outside recommending to air the tires to 80psi, in which I did. After traveling about 800 miles on a trip last summer, I noticed one tire starting to seperate in the center. Swapped it out with the spare to continue my journey home, but stupid me only then noticed that the tires were only Load Range D with a max pressure of 65! Be cautious of over-inflating tires! BTW that's the first time I've seen Load Range E's rated for only 65psi, that's wierd that they did that. I agree with the larger tires and keep in mind the ply ratings too.


I 've spent many years in the truck crane industry. It is common practice for us to "over inflate" our tires. are typical tires call for 110 psi, and we inflate them to 125psi. We have found that they actually last longer for us. We rarely ever wear out a tire. we usually will lose them due to overheating. They overheat because of too much weight. There is nothing that can really be done about that. The machines are just too dang heavy. Some have tripple steer and tripple drive axles. That is 18 tires on one chassis, no trailers. and these tires are big. So, we have found the extra air pressure keeps them cooler and they last longer. Heat is the biggest enemy of most tires.

I noticed one tire starting to seperate in the center.
The only time that will occur is when the tire gets too hot for too long, associated with underinflation. You said you inflated it (them) to 80psi. How low were they before you inflated them ???

I had checked the tire pressures before starting my trip, and as I stated, about 800 miles or so is when I noticed the one tire seperating in the center of the tread. When I finally realized the max pressure rating of the trailer tires where actually only 65psi is why I just kinda figured that was the problem. I then aired all of the tires down to 65 and haven't had a problem since(after changing the bad tire out of course). And yes, I believe the tires were slightly overloaded now that I have gone over everything and realized that the trailer manufacturer installed tires that only held the dry weight of the trailer NOT the GVWR which when loaded(holding tanks, gear, food, etc.) actually puts the weight over the Load Range D tire ratings. The fact that when a tire is over-inflated puts more pressure towards the center of the tire and in turn, I was guessing, would create more heat.

They were at 65psi. That's what the dealership that I bought the camper obviously set them at, but when I saw the manufacturer's sticker on the camper I just ASSumed 80psi was what they were supposed to be at. This is why I now look at both manufacturer's recommendations (tire and vehicle), which is what my stupid a$$ should have been doing anyway!

By installing underrated tires, the manufacturer endangers the property and the live of their customers and others. Have them install a new set or pay for it.

Besides, when a tire blows on a camper, it can slam right through the floor and cause damage that's rather expensive to repair ...

Wish I could, but that's the joy of buying it three years old at the time and I really didn't think the previous owner had another set of tires put on it. Otherwise I would have at least tried to get another set of tires from them.

Sounds like you have a few things going against you... You are puting some strange angles at work for your weight distribution hitch(WDH). All things begin equial and you have the proper tire pressure trailer running level. With the 6" lift I would figure that you have a long drop down to the tongue of the trailer. The longer the drop the harder the WDH has to work on transfering the weight. Some trailers don't trail very well anyway because of the design of the floor plan and that throughs the balance off so make sure you have at least 10% to 15% of your gross as tongue weight. Avoid having anything hanging on the back of the trailer or over the back of the axle. The more tongue weight the better like was mentioned above. I don't know that much about tires but I would figure that any sidewall movement would add to sway. Once sway gets started it can be bad news and very uncomfortible to drive. Also make sure you have a snug fit in your tow beast. Your shank on your WDH is probably 2" where your tow beast is 2-1/2".
good luck and tow safe