When two boats share the same hull type — in this case both the Achilles LSI-365 2008 and the Achilles RS-126 2012 are inflatable non rigid designs with inflatable 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 — Achilles LSI-365 2008 at 12,0 ft versus Achilles RS-126 2012 at 12,5 ft. Weight tells a clearer story for trailering families: the Achilles LSI-365 2008 tips the scales at 115 lbs — 114 lbs more than the Achilles RS-126 2012 at 1 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.
The Achilles LSI-365 2008 carries a rated maximum of 25 hp. Engine data for the Achilles RS-126 2012 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.
For family outings this is probably the sharpest distinction between the two. The Achilles RS-126 2012 is rated for 7 passengers, while the Achilles LSI-365 2008 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles RS-126 2012 could be the deciding factor.
The Achilles RS-126 2012 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Achilles LSI-365 2008 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.
Bottom line: Choose the Achilles RS-126 2012 if your priority is putting more people on the water — it handles 7 passengers and at 12,5 ft it has the deck room to back that rating up comfortably. The Achilles LSI-365 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.