My 05 Sprinter currently scales at 6130. I get an empty weight ticket every so often, every few months or after I've added or removed anything of significant weight. That lets me know how much weight I can haul. The GVWR is 8550, so I can currently haul 2450 pounds of freight.
That's the reality. That's what most vanners out here really do.
There's a legal issue when overweight, but seriously the risk is rather low. It'll be bad if you're overweight and are involved in an accident, even one that's not your fault, but that's still low risk. What is high risk is frame, transmission, rear end, and suspension problems if you carry too much weight more than just a few times a year. I can count on one had, four fingers, actually, how many times I've carried more than the GVWR of 8550. Three times it was nearly flat from pickup to delivery, and once it was over the Cascade Mountains and I'm glad I had the extra weight (3100 pounds) because it was the only thing that kept me from sliding off the mountain in that snow.
But right now, today, if I get anything over 2450 pounds, I'll almost certainly turn it down. That will change up or down with my next empty weight ticket.
A Sprinter with a payload capacity of less than 2000 pounds is nearly useless to most carriers. One that's 1150 would get their contract canceled with most carriers.
I've got four batteries with heavy battery cabling and hardware, a 100 pound fridge/freezer, microwave, printer, laptop, television and satellite dish, a very heavy bunk and heavy shelving, and I carry lots of stuff, too. I did get rid of most of my tools and a bunch of other stuff, which freed up more than 500 pounds. I weight nearly 300 pounds myself. You must have an awful lot of hidden weight in there somewhere.