You can have pos and neg different lengths from the inverter because it is a circuit. Don't forget the monitor's shunt that your inverter neg wire will go to. That neg wire does not go to the battery neg post. The wire from the shunt goes there. You can choose where to put the shunt so it gives you the best wiring plan. Don't cut those 4/0 lengths yet! :)
Don't know your plan, but to avoid drilling through the front cap with a TT where the batts are on the tongue, people drill down through the floor and run the wires down and forward, then back up to the batts. This could add to your distances, don't know.
Just curious, what about the 3ft lengths supplied and the terminals? Are there two pos and two negs, or what?
If you have to stuff a stranded end of that silky thin slippery stranded welding wire in a set-screw terminal and don't add one of those poke things (whatever they are called), you have to use a "strain relief" on the fat wire so it does not get tugged out of the set-screw terminal.
I have a photo somewhere of an example where I had to do that--I will edit it in if I find it.
