I agree with others saying to get the crew cab its so worth it. I wish I had it on my current truck, my next one will definitely be a crew cab. I would get 4x4 but that's up to you, its nice to have. I think the manual will be good when you do get that bigger trailer but for right now the auto will do just fine (plus its nice to relax and drive, especially in heavy traffic). As far as bed length I only get 8 foot beds (that's because I use it work work and haul a lot of stuff usually), but if this is strictly a tow vehicle then the 6 ft bed will do just fine plus the truck will turn slightly sharper (always a plus). I would suggest crew cab short bed 4x4 and you'll have one nice truck.