I agree, I really doubt Workhorse ever built their own belts, most likely they bought them from the low bidder out of the major belt manufacturers (Gates, Goodyear, etc.) then marked up the price.
2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates