The Lund 1648 Jon 2011 is a flat-bottom design and the Lund 186 Pro Sport GL 2010 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 1648 Jon 2011 at 15,8 ft versus Lund 186 Pro Sport GL 2010 at 18,5 ft. Weight tells a clearer story for trailering families: the Lund 186 Pro Sport GL 2010 tips the scales at 1 800 lbs - 1 435 lbs less than the Lund 1648 Jon 2011 at 365 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 Lund 1648 Jon 2011 carries a rated maximum of 35 hp. Engine data for the Lund 186 Pro Sport GL 2010 wasn't available in our records - check the manufacturer's spec sheet before sizing a motor.
For family outings this is probably the sharpest distinction between the two. The Lund 186 Pro Sport GL 2010 is rated for 5 passengers, while the Lund 1648 Jon 2011 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Lund 186 Pro Sport GL 2010 could be the deciding factor.
Bottom line: Choose the Lund 186 Pro Sport GL 2010 if your priority is putting more people on the water - it handles 5 passengers and at 18,5 ft it has the deck room to back that rating up comfortably. The Lund 1648 Jon 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.