Polydrops once noted it went through more than 100 CFD simulations to finalize the thin, tapered form of its wing-like P21 family camping trailer. But apparently, it wasn't finished. Because as it ruggedized the P21 into off-road form, it also further massaged the vessel's already slippery aerodynamic profile. So whether you're worried about draining the battery of your Rivian R2 or sipping up every last drop of gas during a far-flung backcountry tour, the P21X helps ensure that doesn't happen ... and then it sleeps you and the family comfortably.