Re trailer chassis maintenance: my 2006 Stabi rig trailer still looks mint. I squirt fish oil into the crossmembers using a long flexible hole through drain ports. For the exterior, I’ve scrubbed the galv with a worn green pot cleaner before applying two coats of ALTEX marine undercoat, same colour as galvanising. The trailer now has x4 coats of that product and still looks new.
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