Black & gray just ahead of the axles, 1 gray over the axles, fresh in the rear.
On the bright side he said mine pulled pretty good, he has a similar weight trailer, but he thinks this is heavier on the pin.
I think he put his bags up to 40lbs.
Maybe have your friend consider upping the airbags psi maybe to 60-80, maybe even load some supplies towards the rear.
I run mine usually between 70-80 with pin weight in the 2800 range with my Polaris ranger inside, total trailer weight loaded 13,500 lbs 32' toybox.