If it is anything like the Magellen 9165T GPS that came out a few months ago, that was supposed to be RV specific, it is a waste of money. I tried everything with the 9165T on a 6500 mile trip and it is not for RV's at all. The only vehicles that you can put into the system start with a truck with one trailer and go to a Semi. There is nothing for a class A, B, or C RV or even a bus vehicle. You can enter your vehicles height, length, etc, but the unit will ignore what you entered. It took me down a road to an RV park in Alabama and I had to stop at a bridge with a 2 ton load limit. Had to disconnect the toad and back up a few miles to get out of there. The unit also had a problem with just shutting off or freezing while in use. Perhaps, Magellen will do the right thing and take the 9165T units in for a full trade-in value on the 9145 IF it is indeed RV specific. Save your money or take the gamble. My claimed "RV specific" Magellen 9165 is junk.