When two boats share the same hull type — in this case both the SeaArk 1660MV 2009 and the SeaArk RXV 186 2013 are modified vee 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 — SeaArk 1660MV 2009 at 16,0 ft versus SeaArk RXV 186 2013 at 18,5 ft. Weight tells a clearer story for trailering families: the SeaArk 1660MV 2009 tips the scales at 475 lbs — 466 lbs more than the SeaArk RXV 186 2013 at 9 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 power gap is worth calling out. Rated to 90 hp, the SeaArk RXV 186 2013 has a 40-hp advantage over the SeaArk 1660MV 2009's 50-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The SeaArk 1660MV 2009 is rated for 6 passengers, while the SeaArk RXV 186 2013 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the SeaArk 1660MV 2009 could be the deciding factor.
Bottom line: Choose the SeaArk 1660MV 2009 if your priority is putting more people on the water — it handles 6 passengers and at 16,0 ft it has the deck room to back that rating up comfortably. The SeaArk RXV 186 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.