Speaking generally:
Most, maybe all, AWD vehicles can't be flat towed.
Most, maybe all, four wheel drive vehicles with a transfer case that can be put in neutral can be flat towed.
Any front wheel drive vehicle can be towed using a dolly (assuming it physically fits on the dolly).
Most, nearly all, two wheel drive vehicles with manual transmissions can be flat towed. If you don't mind driving a stick shift, this opens up a good many possibilities.
Most if not all two wheel drive vehicles with a CVT cannot be flat towed.
Some two wheel drive vehicles with automatic transmissions can be flat towed, but the majority cannot, at least without some modifications to the transmission.
Any vehicle can be flat towed if the drive shaft(s) are disconnected.
Note that, for weight ratings, it's mainly the GCWR (and not the GVWR or GAWRs) of the motorhome you need to be concerned with for either flat towing or towing with a dolly in as much as neither one has very much tongue weight to support. Obviously you also need to pay attention to the hitch ratings.
