I think Brian's tractor with loader is at nearly 12K lbs, add a 511 backhoe and you are at about 14k lbs. I'd say you would be close to max GVWR even with your tandem dually. I think our tandem dually is rated at 20k on the axles, and we can put a few thousand on the pin. The trailer weighs 7k with the chains and ramps and all, so if we load perfectly we can get about 16K on the deck, but that is maxing the tandems and the rear axle of our pickup. And it is hard to get the axles loaded just as you want them unless you have scales handy.
Dave,
My 511 BH weighs 1600 pounds without a bucket. Buckets are 75-150 pounds or so. The Big
RED Beast is 11,300 pounds without loaded tires, with the backhoe. I have no wheel weights. As is......it was 100 pounds under gross weight on my 20 foot 14,000 pound gooseneck. My dual tandem is rated for 22,000 (2000 on the hitch pin, so it is like yours) pounds and weighs 7400 (on the title). I need to take it and weight it for what weight is on the axles, emtpy.
So now, on paper, I can haul 14,600 pounds on it. So I can add 3300 pounds to the Big
RED Beast in weight or attachments or another machine. I bought the dual tandem to haul the grapple AND the loader bucket, as that overgrossed my 20 foot GN by about 300 pounds. The 24 foot deck plus 5 foot dovetail gives me more room to move the load around and balance it out.
So it seems I could load all 4 tires with rim guard for an additional 1840.4 pounds for a total of 13,140.4 pounds of tire loaded Big
RED Beast!
I have painted marks on the deck of the dual tandem to know where to park the Big RED Beast on it to level it out. Once I know the true emtpy weight on the axles, I will paint on more marks. I also put two white marks on the deck's edge to show where the axles are below.
Brian, how much in wheel weights do you have on your 7520?
hugs, Brandi