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mudski
Being a horse owner mate and transporting them around a bit myself. Seeing the condition of that is a little alarming. There is one more major part of that float I would be thoroughly inspecting and that is the floor structure. Check all steel is in good nick and there is no rot in the timber. The old horses have tiny feet for their weight so ground pressure is high. The last thing you want to happen is for one to go through the floor.
Floats are like builders trailers, no maintenance is usually done until it breaks.