First you need to know what your towing capacity is. Most Class C's are 5000 lbs...but some are only 3500 lbs.
Then you need to determine if you want a manual or auto trans toad.
You can check with
Remco or
Motor Home Magazine.
In your case, the lighter the better. Don't forget you will also need a base plate, tow bar, lighting kit, and supplemental braking system.
Good luck
Ron