Weight Master, check my readings

op wrote:
Trying to get it setup on my new trailer.

Truck
F: 3380 R: 2800

With WD
F: 3420 R:3580 Trailer 4960

Without WD
F:3100 R:4100 Trailer 4740

Anyone that tows a bumper pull trailer knows its your WD numbers that means anything. Now if your towing without a WD then those numbers apply.
Anyhow..... the WD numbers look great. After towing it a few times you may or may not need a fine tune the WD to your likes.

A trucks rear squat doesn't mean the truck is over loaded in all cases. Hell my one ton DRW crew cab 4x4 chevy sits level and sags when weight is added.
Some rigs handle just fine with a bit of sag....and on the flip side I've had some ill handling bumper pull rigs that sat level.