I have a 2007 330 with 250s. We have a Hi-Tide lift that is rated for 20K. I estimate the boat with fuel, gear, and a couple crew weighs about 14,500#, maybe 15,000 with everything filled and full of fisherman. Look at some of the 330 performance data from Grady for estimates. I can't say enough about the Hi-Tide lifts, they are overbuilt and ours is pushing 8 years old with no problems. The only drawback is it is slow as I suspect are all heavy lifts. Hi-Tide uses aircraft quality aluminum (6000 series) and stainless steel on everything else. Helped install a 6K Hi-Tide lift next door and it was quality as well. I have no connection to the company, just happy with their products. With a heavy lift, the foundation is probably the most important thing.