Hey, I just bought a Mav Sport Max. I figure I need a cooler. Anybody have a strong opinion one way or another regarding the 2 coolers that Can-Am shows for the LinQ rack...the 4 gal or the 8 gal? Looks like both will attach via the LinQ system in the back cargo area. Looks like the 8 gal will take up all the space, but has a tray in it for other non-drink items. For the 4 gal, and a day of riding with 4 people, is that big enough for drinks and a few sandwiches?