I know the BAL chocks are not designed for preventing rolling, but they actually do, at least in some cases. On our last TT, we used the BAL deluxe units. The very first time out, I forgot they were still in place, and attempted to pull away, thinking I was all ready for the road. We had a Chevy Suburban at the time, with a 29 foot TT, and it would not move at all. Granted I did not gun it, but the trailer refused to budge. Got out thinking that I must have left a chock in front of a wheel, but found only the BALs. Removed them, and trailer pulled away easily. A rare case of the product being a little better than the advertisement claims, IMHO.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.