The new royals have inverted kingpins and apparently are pretty good. Besides that I don't know of anybody else. Thunder had a few prototypes in the works a few years ago but nothing made it to production. Ventures have very good clearance already, possibly more than some inverted kingpin trucks (don't quote me on this).
The riser pad thing is a bit more nuanced than what professor schmidt said in that video. On paper you get more maximum potential pop, but you have to have the leg strength, jump and technique to make use of it. In practice, depending on what you're used to, what kind of skating you do, the rest of your setup, and most importantly your technique, it may be better or worse.
Thats also just for getting maximum pop on tricks too. A lot of flatground tricks, grinds and slides are harder if the tail requires more time and effort to hit the ground, though some are also easier. Thats why many people like low trucks. I know that personally I don't like going over 54mm on ventures at the very most, despite a higher board giving me more theoretical pop.