Im a huge mountain biker in addition to being a 4x4 enthusiast. Many times combining both for trips I take. Mountain bike during the day and camp/wheel in the afternoon and evening. If you’re driving offroad a bumper swing away with attached 1up rack is the only way to go for these key reasons:
•Highest possible departure angle
•You can swing away the bike while at camp
Im runnning a CBI rear bumper with a reciever welded onto the tire swing out. Been tested on high clearnace trails like Hells Revenge, 7 Mile Rim, Top of the World etc. Never had clearance issues at all.