I own a MNII .  For the past 3 years my paddling partner has been a 160-170 pounder and I am about 210.  We have no problems with him as bowman and have paddled in some windy conditions.  I've also paddled with Wally who was closer to 240 back then ( he's more svelte now) and we took turns being bowman with no troubles.  The key is properly placing the packs so the canoe is balanced front to back and side to side.