Talk to Roadtrek directly, I think they modified the bolts on my 1991 Roadtrek. The sunken floor may have interfered with them...I remember thinking something was odd about them when I changed my rear shocks.

 

I had a look in the Mopar parts manual and it appears it's just a regular bolt you could get at a hardware store. Note that the manual has a mistake, says 1/2-20 nuts and 1/2-13 bolts for years 1990 through 1994. It may have been that the nuts were stuck in between the frame and the sunken floor. Like I said, there was something funny about it but it worked out. My van has had the shocks changed on it twice without damaging the bolts.
Changing the front shocks is quite annoying due to possibility of broken bolts at the bottom and the trickery required to seat the rubber bushing at the top. You need the front of the vehicle on jack stands with the front wheels off to change the front shocks and it takes a jack to push the shock into the hole enough to tighten the bottom bolts.
The rear shocks can be changed quite easily with the vehicle on the ground or parked on some boards to raise the rear wheels a touch.