Say goodbye to flat tires for good by swapping your standard wheels for these never flat bicycle tires. Rather than rely on air, these new tires are made from a solid material equivalent to 100 psi while providing incredible grip and extremely low rolling resistance.
Think something like these old-school 9.00R20 might be a little more appropriate, and they're only 39" tall. They're bias-ply, but they have a good payload rating, they're lighter than these 37" HMMWV wheels/tires, would have less rolling resistance, and they're dirt-cheap. http://www.pirate4x4.com/forum/tow-rigs-trailers/1514554-reworking-blackmores-old-worktruck.html
Do low rolling resistance tires improve fuel economy? To take measure of the benefits, Consumer Reports teamed up with the University of Michigan to analyze our rolling resistance data to calculate potential savings.