The Lund 1648M 2009 is a modified-V design and the Lund 1875 Pro-V IFS 2013 is a deep-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.
Size is the most obvious dividing line here. The Lund 1875 Pro-V IFS 2013 measures 18,8 feet overall (2013), giving it roughly 3,8 additional feet of deck space compared to the Lund 1648M 2009 at 15,0 feet (2009). Weight tells a clearer story for trailering families: the Lund 1875 Pro-V IFS 2013 tips the scales at 1 600 lbs - 1 180 lbs less than the Lund 1648M 2009 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 200 hp, the Lund 1875 Pro-V IFS 2013 has a 165-hp advantage over the Lund 1648M 2009'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 1875 Pro-V IFS 2013 is rated for 6 passengers, while the Lund 1648M 2009 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Lund 1875 Pro-V IFS 2013 could be the deciding factor.
Bottom line: Choose the Lund 1875 Pro-V IFS 2013 if your priority is putting more people on the water - it handles 6 passengers and at 18,8 ft it has the deck room to back that rating up comfortably. The Lund 1648M 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.