CAll around or go to some RV dealers. Any GOOD shop that you would want to do business with with answer all your questions and give you advice on which model you want without pressuring you into buying jack. Also, a good RV dealer might have a package deal (wiring and whatnot) that may be the same price as internet or within 20 bucks or so. Just an idea.
I have a place near me that will get my RV business due to their personal customer service with questions I had with my truck. They are also working with another local shop because I will be installing traction bars and lowering the rear end. They want to make sure everything is perfect when I pull because they want my future business. And I'm OK with that.