Be sure to check your bolts during your weekly equipment and trailer maintenance schedule. I have found over time, the vibration of a trailer loosens them up. Hell, last week one of the bolts on my loader was loose.
Good idea to have a weekly equipement/trailer/truck maintenance checklist.
Mine includes -
Equipment - Check all hoses (unreel everything) and inspect. Check orings (i usually just change all orings weekly as a preventive - they are only like $.20 each). Check all bolts including pump/unloader. Check all hose connections. Check swivels/grease. etc, etc, etc
Truck - check all fluids - brake, tanny, oil, steering, radiator, windshield washer, etc. Check tire pressure/tread.
Trailer - check tire pressure/tread, check boards, check tounge/wiring, etc, etc, etc.
Make your own checklist and do it weekly. While you are around your stuff daily, you are busy and in the job mindset. Taking an hour once per week can pay huge preventive dividends. Like I said, I found an unloader bolt loose. 1 thing I do not have a backup of. Blown out unloader would shut me down at least for a day or two to get another and fix (note to self, get a back-up unloader).
If anyone interested, here is my plain jane form I created to remind me of everything to check. I do my check each Sunday afternoon and it takes about 1 hour. I need to update it, as it is missing a few things, 12 v system, water tank connections, and chemical supplies portioning (I preportion all dry chems into mix bags so that on-site I have exact amounts for either 12 oz spray btl or 1 gal pump up - each morning I fill my 5 or 15 gal containers as needed for the day - usually only Hydroxides or SH& Soap if work is on the schedule that needs that for the day).