I think the advantage of the other vendor "sandwich" design is the spreading the bending/shearing loads fairly equally to all four bolts, which likely are quite adequate, but never intended to be loaded as such. A single bolt might be problematic in an accident impact restraint situation. Case of doable, but it is adviseable?

Andy's design effectively offers the same advantages with less parts.

Last edited by jcc; 09/29/20 01:03 PM.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.