I am on my second set of bolt on simulators. A curb got a little too close to one of the front ones and bent it so I put a new set on the truck. Simulators are OK and easy/less expensive to replace. HOWEVER... They do squeak and pop when I back up with the wheels turned because the front tires have a tendacy to flex outwards plus the tires bulge from the weight of the truck, pushing on the edge of the simulators. Believe me when I tell you it is very embarrasing when people are standing around watching and your simulators are squeaking and popping.

Alloys have an undenyable quality though there is an initial expense. Consider your thoughts when you see a truck with alloy wheels vs simulators.