When two boats share the same hull type — in this case both the Achilles RV-180 2008 and the Achilles SU-18 2011 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 RV-180 2008 at 18,0 ft versus Achilles SU-18 2011 at 18,0 ft. At 23 lbs and 44 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The Achilles SU-18 2011 tops out at 90 hp. Engine specs for the Achilles RV-180 2008 aren't listed — confirm with a dealer before selecting an outboard.
For family outings this is probably the sharpest distinction between the two. The Achilles RV-180 2008 is rated for 18 passengers, while the Achilles SU-18 2011 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles RV-180 2008 could be the deciding factor.
The Achilles SU-18 2011 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Achilles RV-180 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 RV-180 2008 if your priority is putting more people on the water — it handles 18 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Achilles SU-18 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 11 that costs less to run day-to-day.