Two menus were used (transfender menu + weapon menu). Transfender menu to have constant nitros throughout the whole mission (even though it is a bit harder to notice its effect on Dumper when compared to other vehicles), and a weapon to menu that was closed to gain movement earlier. The weapon menu saved about 3 seconds in this run.

There is also reduced train track friction from Snail Trail, but if this has any impact at all it should be very minor.