Sand is a problem when there are tight tolerances between frequently moving parts, of a size similar to the size of a grain of sand. Mostly bearings. The Trailmanor itself is built with large tolerances and no real bearings except on the axles. Most of the things that would be bothered by sand are open, and the sand falls out. The axles have seals that should keep out sand unless they've failed. The stabilizers and the jack on the front A-frame, however, have lead screws and, in the case of the jack, bearings that can be effected.
One thing that can make sand a problem is use of a grease that entraps sand and carries it into moving parts. For this reason, using heavy grease on the stabilizers might not be as good as frequently spraying them with a light lubricant like "WD-40", which is adequate as a rust preventative and may displace grit rather than pick it up.
A dry silicone spray is often preferred for parts where it is an adequate lubricant because it tends not to pick up sand and dirt.
I generally apply white lithium grease to the tow ball just before I drop the trailer onto it, and then wipe it off with a few paper towels as soon as I unhook the trailer. This is mostly because if I don't wipe it off it ends up on my pants, and then on the tow vehicle door, etc. But wiping it off removes any grit it's picked up.
The coupler on my TM has started to bind when I attempt to close or open it, and I'm going to have to spray it with brake-cleaner to get out the old, gritty grease and then re-lubricate it. Brake cleaner is nasty stuff and you need eye protection and old clothes for that job.
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