The dry weight on my 845 shows in the Lance brochure as 2412 lbs. plus any dealer additions (battery, AC, storm windows, roof rack, etc.) and actually came from the factory with a sticker on the rear showing a weight of nearly 2700 lbs. and when I picked it up and took it to the closest CAT scale the actualy weight was nearly 3200 lbs. and with solar panels and a second battery and a couple other modifications it weighs 3400 lbs. and fully loaded for a trip it weighs a total of 4,000 lbs.
The 865 compared to the 855 has half the LPG, half the battery capacity, a third less gray and black water capacity, 40% less fridge capacity, and a third less output from the furnace. Things to consider if you spend time at primative campsites without sewer hookups or in remote areas where fridge capacity is valuable, or off the grid where battery capacity is important.
The lighter weight of the 865 is good as it means you can carry more heavy stuff if you have the room inside. Another camper to consider in the same weight range is the Wolf Creek camper.