When two boats share the same hull type — in this case both the Sweetwater SW 2386 FS3 2008 and the Sweetwater SW 2586 RE3 I/O 2008 are pontoon designs with aluminum construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
On paper these two are close siblings in the size department — Sweetwater SW 2386 FS3 2008 at 23,0 ft versus Sweetwater SW 2586 RE3 I/O 2008 at 24,0 ft. Weight tells a clearer story for trailering families: the Sweetwater SW 2586 RE3 I/O 2008 tips the scales at 1 981 lbs — 1 802 lbs less than the Sweetwater SW 2386 FS3 2008 at 179 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
Both boats share a closely matched power ceiling — 115 hp for the Sweetwater SW 2386 FS3 2008 and 135 hp for the Sweetwater SW 2586 RE3 I/O 2008. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Sweetwater SW 2586 RE3 I/O 2008 carries 37 gallons versus 24 gallons in the Sweetwater SW 2386 FS3 2008. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Sweetwater SW 2586 RE3 I/O 2008 is rated for 12 passengers, while the Sweetwater SW 2386 FS3 2008 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sweetwater SW 2586 RE3 I/O 2008 could be the deciding factor.
One place where both boats are genuinely identical is tube construction: both run 2 aluminum tubes at 23" diameter. That shared spec means stability and buoyancy characteristics are closely matched — the ride difference you'll feel between them comes primarily from deck length, weight distribution, and motor choice.
Bottom line: Choose the Sweetwater SW 2586 RE3 I/O 2008 if your priority is putting more people on the water — it handles 12 passengers and at 24,0 ft it has the deck room to back that rating up comfortably. The Sweetwater SW 2386 FS3 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 11 that costs less to run day-to-day.