When two boats share the same hull type — in this case both the Achilles RS-126 2011 and the Achilles RV-156SB 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 RS-126 2011 at 12,5 ft versus Achilles RV-156SB 2012 at 15,5 ft. Weight tells a clearer story for trailering families: the Achilles RV-156SB 2012 tips the scales at 185 lbs — 184 lbs less than the Achilles RS-126 2011 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.
For family outings this is probably the sharpest distinction between the two. The Achilles RV-156SB 2012 is rated for 12 passengers, while the Achilles RS-126 2011 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles RV-156SB 2012 could be the deciding factor.
Both are inflatable designs, which means they pack down for compact storage, can be carried in a bag, and are dramatically lighter than equivalent rigid hulls. The trade-off is setup time and the need to monitor tube pressure regularly. Tube diameter differs: 18 in. (46 cm) on the Achilles RS-126 2011 vs 22 in. (56 cm) on the Achilles RV-156SB 2012 — larger tubes generally mean more buoyancy and a drier, more stable ride.
Bottom line: Choose the Achilles RV-156SB 2012 if your priority is putting more people on the water — it handles 12 passengers and at 15,5 ft it has the deck room to back that rating up comfortably. The Achilles RS-126 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.