I have a 20ft Sylvin Pontoon with 18in logs. I have romoved all the wood furniture and only left a captins chair and a custom alluminum center console. It is currently running a 1987 90hp Merc. With all that said maybe you can get a idea about weight. Now, in the rear I only have a little more than a 1/4 of the toons out of the water. I have had two adults in the rear corner and water come on the deck. The toons are water tight. Does this look right for these 18" logs? I'm just worried about adding a bait tank, enclosure, etc. The boat didn't have a capacity tag to know what the motor max is.