The Ford with the longer bed and crew cab is only in the 3/4 ton and bigger. According to the dealer where I bought my 2010 F150 Super Crew 4x4, he couldn't even order the long bed in the 1/2 ton super crew. Works for me, though I would surely like to have a longer bed. All of my current trailers are bumper pull and it pulls them like a champ. A 1,000 pound round bale will fit in the bed if I pull the tailgate off. It handles that weight with ease too. In fact last week I pulled my flat bed with a round bale in the bed and four on the trailer. That's about 7500 pounds plus me, momma, and two adult sized kids in the cab. Not a problem with highway speeds (70+) at all. I won't put any more weight that is absolutely necessary on the tailgate. I think it's rated for 500 pounds max. I'm about 250 right now and that is more than I want to put on it but then I am pretty paranoid about breaking things. If I were going to do something to extend my bed for the rear end of the four-wheeler, I wouldn't used 2x6's. Seems like it would be too easy for the the tires to hop off of them and onto the tailgate. I'd take a couple of wider boards, 10-12 inches with and then I'd use a piece of 3/4" plywood to connect them together. I'd extend the plywood from the rear end of the boards about 12 inches or so into the bed. Probably overkill but then, that's just me. I used two large 10,000 pound ratchet straps (the cheap chink ones from TSC) on EACH of the four bales on my trailer last week. Didn't really need to but I'm paranoid that one would roll off and then some stupid idiot behind me would slam into it and then sue me for everything.
NGH