Tom Ray:
I take our Tandem Island out all the time solo, I prefer to sit in the front seat, and typically leave the back seat at home and put the scupper plug in the rear mirage hole ( the extra area is good for storage). Sails as good as an AI (maybe a little faster). My son who is over 6 ft and around 270 was very comfortable. With him and I, and his 4 yr old son on the tramp, we needed the extra sail area the TI provides. If you think about it to get the extra floation needed to carry say 500-600 lbs, the hull, AMA's, and weight would have to grow close to TI size anyway, so just have him get a TI, It's a great boat. It sails just fine solo and/or with two very large adults and is comfortable either way.
LeBron:
We also had an Oasis, and when two large adults are in the boat it's definately more cramped than in the TI. Also with two very large adults the Oasis is a bit more tipsy probably because the center of gravity. We have had our TI out as a kayak (without the AMA's) with two very large adults and it seems much more stable than our Oasis (and much faster too). We still love the Oasis, it's a great boat, but I personally like the TI even more. Hope this helps.
If you look at Stringy's video at (
viewtopic.php?f=70&t=38060) you can see he has three large adults on the TI and they all look comfortable.
One other thing I need to mention is my legs are very thin and small but my weight is 250, so my center of gravity is very high on any kayak.
Bob