I use rubber wheel chocks before unhitching. After unhitched and level fore and aft I install X-Chocks to help prevent rocking and not rolling off. Never had one loosen. If there falling out then either they were not installed correctly or you need to work out a little at the gym so you can tighten them up. JMHO
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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