Chevrolet spokesperson Shad Balch swore I would not, could not, bottom out the 2022 Chevrolet Silverado 1500 ZR2 in Joshua Tree National Park during an adventure on ungroomed public trails. Never one to back down from a challenge, I told Balch, “we’ll see.” The new ZR2 is part of the refreshed 2022 Silverado 1500 lineup that sees…