it's was factory built in the 80s. It's called the boaterhome. It's awesome factory fit and finish with very little custom work. The company died off for obvious niche market issues. I have seen it in person at lake mead in Nevada. My cousin claims he saw the guy take it down on the flooded dry lake bed in boulder city NV at 4 th of July a while back. Owner is a funny older guy.
ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06
waiting to go in... 3.90s, 214/220cam
Wonder what that thing cost new