Yes! In fact, since they support the boat along its full length, they make excellent boat lifts for pontoons and tritoons. The weight distribution of a pontoon or tritoon benefits from the added support. Additionally, there are heavy-duty floating boat lifts on the market that can support up to 30,000 lbs.  Another bonus is that the use of bunks protects the pontoons of the boats against damage as they are being raised and as they rest on the lift. In fact, for many boaters floating lifts are their preferred boat lifts for pontoons.