If you're using a UTILITY trailer, the majority of those are 76" between the fenderwells. you can get the truck on the trailer, but you'll have to crawl out the door window to get out (you'll not be able to open the door, unless it's a 4x4). A true CAR HAULER (yes, there's a difference!) is 82"-83" between the fenders, allowing you to put even a one-ton on it without a problem. You can put anything up to a crew-cab longbed on an 18' trailer, but you will have overhang!!! On a 16', don't go longer than an extended-cab shortbed or a club-cab longbed.
Utility trailers have the rails above the deck, normally 12"-15" high. A true car hauler has a flat deck and NO rails above the deck surface. I do NOT recommend hauling a full-size PU on a trailer 14' or less in length, as you'll likely run into fishtailling problems the faster you go.
I sold new and used utilities and car haulers for six years, so I have experience in this arena.
Your stepside should fit, whether it's on a utility or a car hauler. Just use caution and some common sense, and you'll be good to go. TIE THE TRUCK DOWN securely around the rear axle and around the engine crossmember, use chains with cinchers or tie-down straps with the axle-strap ends. Rope is a no-no! Strap it, chain it, or both!
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patrick66 - '67 C-10 
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