When two boats share the same hull type — in this case both the Klamath 16 ft. Alaskan 2008 and the Klamath 18 Open 2011 are modified vee designs with composite 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 — Klamath 16 ft. Alaskan 2008 at 16,0 ft versus Klamath 18 Open 2011 at 18,3 ft. At 45 lbs and 5 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.
Both boats share a closely matched power ceiling — 65 hp for the Klamath 16 ft. Alaskan 2008 and 75 hp for the Klamath 18 Open 2011. 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.
For family outings this is probably the sharpest distinction between the two. The Klamath 18 Open 2011 is rated for 8 passengers, while the Klamath 16 ft. Alaskan 2008 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Klamath 18 Open 2011 could be the deciding factor.
Bottom line: Choose the Klamath 18 Open 2011 if your priority is putting more people on the water — it handles 8 passengers and at 18,3 ft it has the deck room to back that rating up comfortably. The Klamath 16 ft. Alaskan 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.