The 2612 is a nice unit!
You'll need to really watch how you load this thing with a 1/2 ton. Lance specs the "hitch dry weight" at 845 lbs. This is typically with no factory/dealer options (batteries, propane tanks, generators, etc.), with empty black/grey/fresh water tanks, and, of course, no personal gear.
IMO, batteries (~100 lbs.), propane tanks (~100 lbs), and an OEM Onan generator (~200 lbs. located mid-way between tongue and axles), will quickly add ~300 lbs. to your tonque weight--bringing it up to ~1145 lbs. While you're on the road chances are you'll wash your hands/dishes or take a shower and transfer water from the freshwater tanks (centered over the axles) to the forward mounted black/grey tanks and potentially add another ~100 lbs. of tongue weight. Plus, you'll easily stow at least ~150 lbs. of clothes and misc. items (probably much more) in the forward located storage areas (especially in the bedroom area). At this point you could have a potential tongue weight of ~1395 lbs. Although the garage on the 2612 is located behind the trailer's axles, IMO it's not located far enough behind for heavy toys/gear to significantly reduce tongue weight.
If the payload on your truck is 1628 lbs., you're really going to have to watch things closely.
I have a toy hauler a bit smaller than the 2612 which has a factory rated "hitch dry weight" of 725 lbs. If I'm not careful loading it or watching water transfer/use, the tonque weight can easily soar over 1200-1300 lbs.--this is with 1500 lbs. of toys and gear loaded in the rear, garage area.