Recently we have witnessed 2 fifth wheels have the front landing legs collapse. Both had the pins that are spring loaded and attached permanently to the legs. Both were the type that only went through one side of the leg and didn't extend to the hole on the opposite side.
One came down on the truck doing about 2K damage, the other came down on the concrete pad damaging the black water tank and plumbing and who knows what else.The second one was next to us and came down around midnight, they had quite a ride.
Both units had been setup for several days before they dropped.
I would be very careful with this type of pin and make sure it seated all the way since they don't extend very far beyond one hole on the leg extensions.
2007 40' Country Coach Inspire Da Vinci
Mustang convertable toad