KDJ is correct, you need to check your manufacturer recommendations. There should be a tag on the door frame with all your weight limitations spelled out. Total weight, towing weight, and pulling weight are usually listed. Also check your hitch to see what weight limit it has. A class 3 hitch can tow 5,000 pounds, but many of the smaller coaches come with a smaller hitch that may only be capable of 3,000 pounds. From experience, NEVER exceed the manufacturers recommendations. I towed a 5,200 pound car on a 5,000 pound hitch and bent both the drop down hitch and the hitch frame. Almost caused some major damage that way.
Good luck!!