I've heard mixed reasons why you don't find many. Ranging from structural integrity to in ability to load/unload in most camping spots.
The only other one in production (assume you want new) is the Palomino Puma Unleashed 30THSS as far as I know. KZ might have one too.
Most of these are limited to 8' (96") wide, I'm not sure any were ever 102" wide so watch to make sure you can load your Harley or ATV in that space.
Two Wire Fox Terriers; Sarge & Sully
2007 Winnebago Sightseer 35J
2020 Jeep Gladiator Rubicon