My absolute favorite truck I've ever wheeled in was an 87 Suburban 3/4 ton on 38.5" TSL SX tires. It had a wheel base of 129" but it went ANYWHERE I pointed it. I had 11" of lift on it though, and I didn't mind laying the body against something and using wheelspin to pivot it around trail obstacles... That truck went more places in 2wd than most folks can go in 4wd.
I think if the lift height and tire size is right, and you don't mind body damage, then a longer wheelbase is very capable.
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