I've seen a few motorhomes/motorcoaches towing small SUV's behind them and I can't imagine why. The gas mileage of them is almost as bad as the motorhomes/motorcoach

. For the record a stock Liberty typically gets 22 MPG and weighs about 5000 lbs.
If you're not planning to any offroading then perhaps you could choose a lighter 2WD car for a tow vehicle.
I think that for some it is more a statement of "Look at me...Look at how much money I have!
(In reality it is more like "Look at how much debt I'm in!)
The best thing I have ever seen was when Jennifer and I lived in Red Deer, Alberta.
And it is legal to do this in AB.
One Ford F750 Crew cab with 5th wheel 40+ triple axle RV.
Behind that? Well a 28-35 foot ski boat of course.
Then a tandem axle 30+ foot trailer with clear plastic sides so that everyone can see whats inside... ATV's, Dirt bikes, Jet ski X2.
No crap, real life. Ask my wife.
It even had Alberta license plates on it...
First thing Jen said was, He's either very short and has a very small pee-pee- henceforth suffering from severe "Little man syndrome", wealthy, or both, or the other option I am not allowed to post here!