I purchased a Garmin DEZL there are a couple of versions of it now. It is made for over the road truckers but has a RV setting as well. I utilize mine in truck mode when towing it seems to give me more info. You set up a profile with your rig's height, length, weight, etc. It utilizes the profile to not send you on routes with low clearances, weight restrictions, etc. It shows truck stops and stations with diesel fuel which is useful for the set up I have.
I would suggest if you buy any type of Garmin device get one with the model number ending in LMT. It includes lifetime map updates.