What ~55qt cooler would you get for a long weekend of general car camping? For example, from a quick search I see I can get a igloo 55qt marine ultra cooler for $60, a lifetime 55qt for $107, and one of the cheaper 55qt roto molded coolers for $200. Are the roto coolers really worth 3x the price of a marine cooler? Is 55qt enough for two people for three days? Should I spend a little more and get one with wheels?