Does anyone know the axle rating on the 2020 imagine 2600 RB
If it has 6 lug rims then they are 4400 lb axles.
This may be true for GD, but as an FYI, I have seen 3500# axles with 6 lug drums. in fact I once swapped 6 lug drums onto 3500# axles. they bolt right up.
I guess you can make just about anything work, but in the case of the 2600RB it had 3500 lb axles with 5 bolt hubs until mid 2019, and GD apparently (finally) decided that they were too light for this trailer and made a mid year change. Of course, I'm talking about Dexter axles as delivered by GD. As Ynot4me2 stated, it's best to look at the sticker on the axles.