Even after flipping the axels, you may want to consider installing skid wheels.
Our previous Sunline was a T-2670, which sat low. I never flipped the axles, but took the drag bars off and installed skid wheels. It was dragging so much that the drag bars were bending. The skid wheels saved the trailer from a lot of damage.
We now have a T-280SR which sits higher, but I still installed drag wheels as added protection. Figured it’s better to be more protected, just in case.
I mounted the skids wheels on the frame just before the bumper.
Our T-280SR has an I-Beam frame, so I had to drill 4 holes through the beam to attach the side wheels.
I believe the non-slide trailers have the C-Channel frames. Our 1999 Sunline T-2670 had a C-Channel frame. On the T-2670 I only had to drill 2 holes to attach the mounting bracket for the skid wheels. I centered the mounting bracket on the C-Frame, and the bolts for the skids wheels were spaced enough that they could be installed without interference from the C-Frame.
Hutch