Yep, I’m familiar, I think belts are better utilized at lower power levels.
My Boardy McBoardface was using 15mm wide belts for a while and while they kinda worked with idlers on both sides and substantial tension, however it created unnecessary wear on my motors and I was getting 100mi out of a pair of belts if I was lucky, that was at 12s 2wd 80a/motor. My pre built zealot on the other hand (12s 15a/motor) has used the same belts for the past 700 miles and they’re only now starting to slip.
What trucks are you using? That does quite a bit to define what drivetrain options you have. Chains are cool and can be pretty inexpensive to start but IMO, a decent gear drive is a good investment, especially when you reach the level of power where belts become insufficient.