Six + gear means two trips. For a weekend you could carry three adults plus a good selection of gear in one trip. If they pack well you might get four. It depends on what level of gear you plan for. A tent w/ sleeping bags, backpacker's stove, & non-cooler food would probably be doable at four plus gear. Adding cooler, lawn chairs, etc. will cut at leas one person worth of room from at least one trip. This assumes that you only pack up to the level of the back of the seat. Putting soft stuff above this will increase cargo capacity.