A No. 16, which is the previous generation from the 16L/M/S, weighs 2200 lbs without motor. The No. 16S has a taller column, bigger table and heavier cutter head. Probably at least 2500 lbs with motor, maybe as much as 3000 lbs.
Rent a Bil-Jax type lowering trailer if you can. You can always call a towing company and have them bring out a boom-type wrecker to load it for you.
Don't mess around if you're thinking about buying this. I'm surprised it's lasted as long as it has at that price!