This wheel modification widens the rear wheel surface area by two inches by replacing the original equipment wheel assembly with one-inch wider tires, hopefully allowing for better traction on slopes. The spacers used widen the wheelbase by three inches.

Original Rear Tire Size: 18x7.50-8
Replacement Rear Tire Size 18x8.50-8

The intended one inch spacer was not wide enough to extend beyond the original lugs, so 1.5" spacers were successfully substituted.

Rock Trix 1.5" Aluminum Wheel Spacers:
https://www.amazon.com/dp/B01LXPRKQT

Replacing the front wheels is not demonstrated in this video, but it's very easy to do, so I've included a link to the front wheels I bought to replace the originals. These front wheels are flat-free wheels, never requiring inflation.
https://www.amazon.com/dp/B07Y291J74