The line between today's 1/2 ton and traditional 3/4 ton is pretty blurred and a 1/2 ton's capability depends a lot on how it was optioned out. We tow a 7K lb TT and replaced our F150 with an F250 and the difference is huge and we have no problems with brakes on steep downhills, power up steep grades, accelerating, sway or extra payload in the bed on longer trips. I'm now a big 3/4 ton fan. We went through Utah last summer and if that's where you are and plan to get around much, I'd go 3/4 ton. I love our 4.10 rear end for hills and accelerating. What I don't like is 4WD and would rather not have it. You might even find down the road that you want a longer and heavier TT and then your 3/4 ton would be able to handle more. I'll never understand those who say "naw, a 1/2 ton will be plenty fine". Have they towed near it's limit in mountainous areas or towed with a 1/2 & 3/4 ton and had real life comparisons? If we were planning to only camp close to home and wanted to use the truck for regular commuting to work I might look closer a 1/2 ton truck (if properly optioned for towing 6K lbs).
Is the 6000 lb figure you are quoting dry weight or GVWR? Never shop by dry weights only as the actual total weight (GVW) and tongue weight is always higher. If you are new to this and don't know much about cargo carrying capacity and what you'll be loading into the TT, go by GVWR. There is a huge variation in CCC between brands and models and some of them aren't as high as they claim (like ours) plus towing with one or more full holding tanks will add a lot of weight. Don't forget to get a good WDH - we have a Reese DC and because I love it, you should get one too. :)
BTW, towing through Utah was great! Never been up at 6600 feet elevation or where there's an 80mph speed limit on the interstate.
