If you go by 2017 Ford towing specs for the larger Class As built on F53 chassis, it can be seen that much will depend on how loaded down the motorhome is relative to Gross Vehicle Weight Rating, and also on which chassis rating the MH is built on.
Notice Gross Combined Weight Rating varies with GVWR. This is likely due to different final axle ratios which affects GCWR and thus tow rating.
These trailer weights are based on a motorhome that is loaded to maximum GVWR, so I assume they are not true maximums if motorhome was nearly empty, as an example.
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