I'm working on my 9 year old box trailer (a Lynton Loadtrekker), replacing the rotten plywood floor.
There is some rust - see the pictures below. I think this is a torsion bar suspension system (based on a little Internet reading... I'm no expert and have no documentation for the trailer).
I've shown the right wheel. The left wheel is corroded in the same way, although the rest of the chassis seems fairly clear of rust.
How should I assess this? I think this is surface rust only and there are no holes through the structure, but I haven't looked closely yet (I'll try and take better pictures tomorrow).
Is this still safe to use?
Should I treat the rust (wire brush, rust reducer, then paint)? Presumably there are bearings inside the circular part - do I need to take special precautions?
There are more pictures of the trailer in a question I asked a few years ago whilst re-sealing the roof.
Update: better wheel pictures...
(Opening each image in a new window, via right click, might make it possible to see them at a larger resolution...)