Agreed- Single axle could probably tow a 80 size + excavator without trouble.
We will move a TK TL130 and a Deere 35D on a tandem axle deckover that weighs 5k. Slow sometimes but not an issue.
Do you know what spec DT466 it is? Our smaller truck is a 190hp 466 that is turned up. Pretty strong truck for what it is.