Re: Pontoon weight
Depending on furniture and everthing else on it can vary quite a bit, just looked in my Bennington catalog and a 22' weights 2300lbs with no motor and a 25' is 2600/ no motor, keep in mind they have alot of furniture on them so yours could be quite a bit less.
As for tounge weight don't know, I think the rule is 10% of trailer weight but not sure on that.
You will need a full size 1/2 ton truck to pull it.