The Lund 1648M Jon 2012 is a flat-bottom design and the Lund 1810 Predator SS 2011 is a modified-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department - Lund 1648M Jon 2012 at 15,8 ft versus Lund 1810 Predator SS 2011 at 18,1 ft. Weight tells a clearer story for trailering families: the Lund 1810 Predator SS 2011 tips the scales at 965 lbs - 545 lbs less than the Lund 1648M Jon 2012 at 420 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 125 hp, the Lund 1810 Predator SS 2011 has a 90-hp advantage over the Lund 1648M Jon 2012's 35-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 Lund 1810 Predator SS 2011 is rated for 5 passengers, while the Lund 1648M Jon 2012 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Lund 1810 Predator SS 2011 could be the deciding factor.
Bottom line: Choose the Lund 1810 Predator SS 2011 if your priority is putting more people on the water - it handles 5 passengers and at 18,1 ft it has the deck room to back that rating up comfortably. The Lund 1648M Jon 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.