Talkin' Class C, or A motorhome? A good quality Class A- Pusher/Diesel will tow anything you want to put behind it legally.
A good friend (And a Class A Dealer) in Columbus used to grab one of his homes for our Yearly fishing trips. 10 guys and kids, gear and towed my 26' Marathon-Flybridge Boat with twin Volvos, Our total length was 72'. Just a wee bit past legal! Weight of the boat with 6 electric downriggers, fuel, water, gear was right at 13.5K.
HE'd be passing semi's going up the mountains in PA! Mileage, I think was around 14 to 17 towing my boat!
He even had a washer/dryer combo in it! That was amazing on a week long trip with the kids! But, I know the cost was upwards of 175K for the motorhome!
If I had the funds----no question!