How to test drive a Class A ??

Yes they will let you test drive them. I'd strongly recommend, testing driving several. Different models will drive differently, due to different Chassis manufacturers. wheelbase, weights, suspension etc etc. If undecided about gas or diesel, drive both. typically, the Roadmaster R4R has a very firm ride. It's a diesel chassis which was manufactured by Monaco...had some other problems too, but those can be taken care of with $$$....rear trailing arms are the problems.....if you do look at these, make sure it has been fixed. Good luck, and test drive everyone your interested in, If the dealer won't let you test drive, then he's not interested in your business....you really should run into anyone like that though.
Brian