As soon as things dry out from a thunder storm we had, we're heading on out to Zion National Park in Utah with our 5th wheel in tow. Maybe I will run into some other Diesel Place members out there. I will be towing a 31' Jazz trailer.

Are you coming via I-80 or I-15?

You might not be going to try this, and you already might know anyway but just in case.
You will not be allowed to tow the fiver into Zion, they will turn you around at the gate.
We set up at Bryce Canyon, did Bryce one day and then Zion the next.
Both are well worth seeing. We stayed at the Bryce Canyon KOA while there, not that nice of a campground but it served the purpose at the time.

oh, while in Zion, Do take the bus to the area that is off limits to the cars. Its worth the trip up to see that section of the park.
Enjoy.

one other thing, if you have a dually, you have to pay a couple bucks and they have escorts that stop traffic in the tunnels and bring you through alone. Even though I thought there was more than enough room to go through with two way.

We stay at the Zion River Resort off of the 9. From there it's a 15 minute drive through Springdale and to the Visitor Center where you park and catch the free transportation to the different hiking trails and the Virgin River. From my home we take the 15 north through Vegas to get to the 9. It is about a 6 hour drive.