One thing to keep in mind is if you get a DOT audit. I was back hauling a tractor for someone in the Midwest. When I was going through PA on the way home to DE, I got stopped at a checkpoint. I have a class a with air brakes and hazmat endorsements. The cop told me that they were now fining anyone towing a tractor with more than a "small" fuel tank that didn't have hazmat insurance coverage. I wasn't quite sure what he was talking about. He went on to say the state is now considering a rolled over trailer with a piece of equipment on it that leaks diesel fuel all over the road a hazmat situation. "You need to carry the proper insurance and a hazmat spill kit".
Luckily I already had both. This was only a 70hp tractor with about 5 gallons of diesel in it. I would suggest you check your insurance coverage and buy a spill kit for your rig. I have way over a million miles logged of hauling with an apportioned license and that's the first time I have heard that. Called my DOT auditor when I got home and he said it was true.