Adding a larger capacity hitch will not increase the tow capacity of the MH. The engine, transmission, brakes, frame, etc go into calculating the tow capacity which is provided by the manufacturer. You can search how to increase tow capacity.
As for the Explorer, it cannot be towed on a tow dolly as it is a rear wheel drive vehicle when not in 4 wheel. Check the owners manual for recreational towing procedures. There are other factors to consider for towing. Year, transfer case, transmission, etc.
Just my two cent opinion..
