The 7 could do it but just barely. It'd be a balancing act with the frame positioning on the pontoons. The problem is that when you balance it for a full livewell, it rides awkwardly in the water when the well is empty and won't glide very well. This is the problem with my boat but it's due to the "rocker" pontoon design rather than length. The less the pontoons taper, the better they'll be able to support the weight and the better your glide will be.

Chris