You can search "toad dingy" and you should find the downloadable vehicle lists of towables 4 wheels down. Check the manual, check with another dealer. The salesman may just have another agenda. At worst, get a written confirmation that it is towable 4 down before you buy. I think it is mostly to do with the transmission.
I seem to remember that a lot of Jeeps are ok. My only issue with a jeep is they don't exactly ride well for around the town driving. I do like the Jeep Cherokee, rides better, but my wife thought it was kind of old ladyish.
Your choices need to match with your mh. For example, I read that Breeze 32 owners liked towing the fit, but some found towing a jeep was ok...very personal as to performance.