Pontoon & Tritoon Boat Lift Guide: Sizing, Bunks & Toon Spacing
Pontoons and tritoons don't lift like a V-hull. Here's how to size for fully-loaded weight, set your bunks to outside-to-outside tube width, and support a tritoon's center toon so you never press a tube.
Key takeaways
- Size a pontoon lift to fully-loaded weight plus a margin — most family pontoons fit a 7,000–10,000 lb lift ($8,000–$13,500 installed); heavy tritoons can need 16,000 lb.
- Measure outside-to-outside tube width, not deck width, to set bunk spacing so each outer toon lands on its own bunk.
- A tritoon's center toon sits lower and must get its own center bunk or adjusted height, or you'll press and dent it.
- Toons spread their weight across long tubes, so a same-length pontoon often needs more lift and wider bunks than a monohull.
- Choose padded bunks for simplicity or a full-length rack for easier drive-on in wind and tide.
A pontoon is one of the easiest boats to love on a Southwest Florida canal, and one of the easiest to get wrong on a lift. Most sizing advice quietly assumes a V-hull: one keel, a deep deadrise, weight down the centerline. A pontoon is the opposite. Its weight rides on two or three long aluminum tubes, spread wide and sitting shallow, and that changes how you size the lift and where the support has to go.
Get the spec right and your toons come out of the salt clean and dry after every trip. Get it wrong and you do real damage — a pressed bunk dents a tube, an unsupported center toon crushes on a tritoon, and either one is a repair you’ll feel. Here’s how to size and support a pontoon or tritoon the right way.
What size boat lift do I need for a pontoon?
Size the lift to your pontoon’s fully-loaded weight plus a safety margin — never its length. Most family pontoons fit a 7,000–10,000 lb lift; heavy tritoons with big outboards can need 16,000 lb.
The brochure dry weight is only the starting point. By the time it’s in your slip, you’ve added a full fuel tank, freshwater tank, batteries, furniture, a Bimini or hard top, and all the gear aboard. Add it up, then add a margin so the lift isn’t running at its limit every cycle — that margin carries you through years of salt and sun.
Pontoons fool people because they look light. A 24-foot tritoon with a big outboard and a hard top can weigh as much as a 28-foot center console once it’s loaded, and a same-length pontoon often needs more lift, and wider bunks, than a monohull. Our what size boat lift do I need guide walks through the loaded-weight math.
| Pontoon / tritoon | Typical lift class | Installed cost |
|---|---|---|
| Small 2-tube pontoon, modest outboard | 7,000 lb | $8,000–$13,500 |
| Family pontoon, loaded | 10,000 lb | $8,000–$13,500 |
| Heavy tritoon, big outboard + top | 16,000 lb | $14,000–$19,000 |
How do I measure my pontoon for bunk spacing?
Measure the outside-to-outside width across your outer tubes — not the deck width, not center-to-center. That single number sets how far apart your bunks must sit so each outer toon lands squarely on its own bunk.
This is the measurement people miss. The deck is wider than the tubes, so if you space bunks to the deck, the toons drop between them and the deck rails take the load — exactly backwards. Bunks have to land flat under each outer tube, where the aluminum is strongest:
- Measure tube to tube, outside edge to outside edge. Run a tape across the two outer tubes at their widest and write down that number.
- Note the tube diameter. Bigger 25- or 27-inch performance tubes ride differently than standard 23-inch tubes.
- Confirm two tubes or three. A tritoon’s center tube changes the support plan (more below).
- Record overall length and motor setback. Long overhangs and heavy outboards shift the balance point sternward.
We set bunk width and bunk height to your exact boat at the estimate, so each toon seats flat and the load is shared evenly across the tubes.
Why does a tritoon need extra center support?
Because the center toon usually hangs lower than the two outer tubes, a standard two-bunk lift can press or crush it. A tritoon needs a third center bunk or adjusted bunk heights so all three tubes share the load.
Tritoons get their extra flotation and ride from that third tube, and on most builds it sits slightly lower than the outer two. Put that boat on a plain two-bunk setup sized for a regular pontoon and the outer tubes land first — leaving the center toon either dangling unsupported or jammed down onto the lift frame as the boat settles. Both cause dents, and a creased toon can take on water.
The fix is simple when it’s planned from the start: a dedicated center bunk, or a bunk-height adjustment that lets the lower center tube carry its fair share. The cost difference is small. The cost of not doing it is a tube repair, so always tell us up front if your boat is a tritoon.
Pontoon rack vs. bunks — which is better?
Both work well in salt water. Padded bunks spaced to your outer tubes are the simplest, lowest-maintenance choice for most canal slips, while a full-length pontoon rack makes drive-on alignment easier in wind and current.
Here’s how they compare for a Southwest Florida slip:
- Bunks — Two (or three) carpeted or polymer bunks under the tubes. Fewer parts, less to corrode, easy to inspect. The default for most Cape Coral and Fort Myers canals with some shelter from the wind.
- Rack (guide-on rails) — Full-length rails the toons ride between, so the boat self-aligns as you drive on. The edge is forgiving alignment on a windy, tidal, or open-water slip — handy on the wider stretches off the Caloosahatchee or Charlotte Harbor where a crosswind pushes a tall, flat-sided pontoon around.
Either way we build to the same salt-coast spec: marine-grade aluminum frames, 316 stainless cables and hardware, and sealed marine motors — see everything we build on our boat lifts page.
Built for salt — and for a flat-sided boat
Two things age a pontoon lift fast on the Gulf coast: salt, and the boat itself acting like a sail. A tall pontoon catches wind and surge, so the lift, cradle, and pilings all have to be sized for more than the boat’s weight — and the pilings driven to the right depth for your canal bottom. During hurricane season from June through November, that margin is what keeps your boat out of the water and off your neighbor’s seawall.
Get your pontoon spec’d right
A pontoon or tritoon lifts nothing like the V-hull most sizing charts assume, and the difference between “perfect” and “pressed a tube” comes down to loaded weight, bunk spacing, and center support. The only way to nail all three is to look at your actual boat and slip.
We give free on-site estimates seven days a week across Cape Coral, Fort Myers, Naples, and the rest of the coast — measuring your tubes, checking your pilings, and confirming the right capacity before we quote a dollar. See everything we build on our boat lifts page, or call (239) 397-3400.