As an owner of half tons and an equipment trailer and travel trailer I’m always fighting payload capacity. What I’d suggest is looking at your hitch/manual and first learn whether you’re required to use weight distribution at those tongue weights.
If yes, then I’d get one, though I’d be hopeful to not need it with the boat to stay away from that situation with the aluminum trailer. These devices are fantastic and on my half tons have kept me in allowable payload ranges.
If no, then what are you trying to accomplish? Just less rear end sag? If you’re within tongue weight and overall payload limits, I’d 100% go for suspension support such as the Timbren SES like previously mentioned, although I’m partial to the Sumo Springs brand. Same concept, replaces your factory bump stop. I had the 1000 lb capacity Sumo Springs on my 2008 Chevy Silverado. The truck rode the same unloaded and even loaded was not harsh. The weight distribution hitch allowed me to stay within all my weight limits. But the Sumo Springs helped relieve the sag and all that extra stress on the rear suspension. Particularly if I wanted to move around the travel trailer on my property without the hassle of hooking up the WD.
The reason I like these two products over air bags is they’re dirt simple and much less expensive. The air bags is a super cool concept and gives you that flexibility of adjustment, but in all my reading I kept finding long term they are prone to fail. I didn’t want to invest twice.