A friend of mine thought as you do. EVERY wheel bearing he serviced, he "pre-loaded", starting with his own 1979 Ford pickup.
He was going on a trip, and re-packed his front wheel bearings (4 X 4), and was PROUD of snugging them up. One side failed within 100 miles, and the other before he got back home.
He wound up working at the local Cenex, and our shop got to haul in and repair several trailers and medium-duty trucks he had "pre-loaded" the wheel bearings on.
At our shop, we have always followed manufacturer's instructions when available, or set up wheel bearings WITHOUT preload, and I can't recall even ONE single instance where we have been asked to warrantee a wheel bearing job, or EVER heard of one of our jobs failing.
YES, you preload differential carrier side bearings or pinion bearings, but that is a different matter, altogether. In MOST cases, those bearings are a different series, with a different angle to the rollers and races.
I have yet to see a single manufacturer's instruction to pre-load a set of tapered roller bearing wheel bearings.
WHY are you complaining about the job the guys did on your trailer... have ANY of the bearings failed???
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