I'm going to second three things.
1. Go to an RV show and spend a day. Don't focus on brands. Walk the floor plans and you will get an idea what you like. Then you can look at floorplans online as a more informed consumer.
2. Don't buy an ultra lite if you are making longer trips or potentially full timing.
3. Buy used, at least for your first TT.
Also, I think you should at least consider an F-250. It doesn't need to be diesel for what you are looking to do but will give you more flexibility on tongue weight when choosing a TT
