Most of the people I know who use Motor Homes and Morgans together use a braked twin axle trailer. This then places weight restrictions on the towing vehicle.
From memory, if your Motor Home is less than 3.5T GVW all will be well. Once you go over 3.5T GVW then, unless you have more than the standard car license, you have a 750kg weight limit again.
We researched this when we had a 7.5T GVW horse box and were looking into how to take a car with us on holiday with the horses. We ended up selling the lorry and buying a Disco 3 and trailer. Which means the Morgan gets left at home when we take the horses to Norfolk. The plus side is that SWMBO can (but chooses not to) drive the Disco / trailer combination but physically was not strong enough to manage the gear box on our Renault Midliner - which could have been a major problem had I been incapacitated 100 miles from home with 2 horses etc to get home.
