the rating of the bar is in conjunction of it's fitment to the chassis, not just the bar standing alone...vehicle manufacturers don't rate the vehicle chassis, bullbar manufactures have to rate the bar inclusive of the chassis as fitted to the particular vehicle.
Correct.
As a real life example, we designed and now manufacture recovery points for the Amarok here in Melbourne, and before we released then, we tested them to the WLL we wanted to sell them at, twice the WLL, three times and then to destruction.
The test was performed on the section of chassis rail (yes, we bought a chassis expressly for performing this test) that each recovery point bolts to.
The recovery points then underwent an engineering assessment before we tested on our own vehicles and then went into production.
It's worth noting also that most recovery points are only rated when used with a bridle attached to both recovery points, to ensure the chassis doesn't get shock loaded on one side, which can lead to permanent, irreparable chassis damage
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