The weight and maneuverability still matter in the woods, and especially camping.
Having experienced the joys of hopping into vehicles in a hurry with machine guns, the shotgun has the same issue.
Most patrol cops given a chance, will usually use a (NFA regulated) 14" shotgun for the maneuverability.
If you manage to burn off six rounds of buckshot or slugs and have not fixed the problem with a shotgun.... either you're missing and need to reload, or you've been charged by a squad of bears in which case, kiss your butt goodbye.
I'll lose a round or two on tap to gain the weight and maneuvering advantage.
At one time I"d have said the 20" as well. Experience taught me otherwise.
"And Shepherds we shall be. For thee, my Lord for thee. Power hath descended forth from thy hand, that our feet may swiftly carry out thy command. So we shall flow a river forth to thee and teeming with souls shall it ever be. In nomine Patris, et fili, et Spiritus Sancti. Amen."