Sorry it was getting dark when I took this pictures. Here is one of our rigs with a maximum load. We have a driver recovering from surgery and our Freightliner is scheduled to the max, so this is my delivery load for tomorrow. 4 tractors because we were able to get two of them side by side on the rear. Otherwise 3 is generally a full deck.
For the cautious types, yes I have a CDL, run a log book, and have scaled the load and I am legal on all axles. All the same, it's a heck of a load and I start slow, stop slow and leave a lot of distance for either. The truck is a 2006 Duramax with a 6-speed manual trans, no muffler, exhaust brake, oversize rear diff cover for cooling, 10-ply Toyo MT's, and otherwise mostly stock. The trailer is a 27' tandem dually, rated at 20k on the rear axles.
The last picture is of our company Unimog. In theory it can haul a small tractor on it's little flatbed, up to about 3500 lbs, but we've only loaded a tractor on it a time or two just messing around. It's more for fun.