I think you will find the 5'r much easier to hook up and far more stable when pulling than the TT. The 8ft bed would be my choice and that eliminates the need for a slider hitch. Pull-rite Super 5'r is what I have and I'm very happy with it. See you on the road!
Wally,
We have a 2005 29WBLE and I couldn't ask for a better 5'r. Bought it used so I can't comment on the warranty. The most important thing is to deal with a reputable dealer. Sounds like your truck should handle it with no problems. Let us know what you decide and happy camping!