Here is a simple idea....first determine what unit you want...determine what it weighs....add about 20% to that weight
...then select something that will tow more than that weight
.....otherwise you will not be a happy camper.
It is easy to damage or destroy a tow vehicle if you try to tow more that the manufacturer has specified....safety is another concern...don't let the tail wag the dog.
Penny...good luck in your quest..always seek professional advise...there is much bogus advise on the Internet....know your sources for towing information.