You will find that each owner will prize his model.
I own 2 TC in 12' size and when Fleetwood has more spacious design with more room under shower, I liked Lance 1162 for side entry.
Even when I loaded camper to 6300 lb, I had 9000 lb on rear axle, so 1000 lb to spare, but my truck has lighter aluminium bed.
I don't think pontoon boat will add any significant load, but make sure all heavy stuff (beer, anchors, chains) will get loaded in truck cabin.
Host will be probably the heaviest on the list.
My main advise with TC shopping >>> enter the shower, close the curtain and check if you can turn around without knocking anything down.
Then sit on the throne and make sure your legs are comfortable.