Recommendation towing capacity advice 3500 lbs

I would fing anything with a 3500 GVW rating or lower. Jayco make some good units IMO..

You probably should add an extra trans cooler, and possibly an oil cooler.

You will need a weight distribution hitch.

2500 lbs empty jayco here.

http://www.jayco.com/products/travel-trailers/2014-jay-feather-slx/16xrb/

Any one of the SLX units will do since none are over 3500lbs..

http://www.jayco.com/products/travel-trailers/2015-jay-flight-slx/floorplans-and-prices/