Bob - the Chevy beds starting in 2020 are 6 inches longer than the previous model Silverado. Based on our experience, that extra few inches would most likely have saved us but you need to consider where you will be camping, if you will have difficult campsites to back into, and enough spotters. When we blew the window, we were fairly new to towing, had a really difficult site, and could have used one more spotter. Yes, you have to use a wedge with the turning point that is compatible with your hitch, and also with the slider hitch. When hooking up with a wedge, you have to be almost straight on which can add to the challenge of hooking up, but is completely doable.
Something to consider with a wedge is that if you take your camper to a dealer, you will have to remove the wedge and lock out the turning point so that the dealer’s equipment can pick up the camper. You then have to reposition the wedge and unlocked the turning point before leaving the dealer. While using the turning point unlocked, we took it to the dealer for service and when picking it up, the dealer left the bolts sticking out on the king pin where the wedge would go and the bolts damaged our old hitch when we turned - didn’t realize it until we got home. We had left it in the locked position to go home and put the wedge back in the correct place and unlock the turning point.
Hope this answers your questions but if you have more, just let us know!