The 992 is one of Lance's heaviest campers with a bare bones dry weight of 3405 per their brochure. I would expect that it will weigh around 3700 lbs. with any additions (second battery, solar panel, AC, etc.) and that is before putting water in the fresh water tank at 8 lbs. per gallon.
This is a camper for a DRW truck. For a SRW truck it would be better to go with the lighter models like the 1050 which weighs 600 lbs. less than the 992.
Go to the Lance website and you can download the brochures for current and prior years and get the "dry weights" to use as a starting point.