Wall behind pit?

[Tory]

I have a raised runway, and the pit sits on a deck. The pit is a USC 1790, decent sized. My issue is that the pit slides ever so slightly after each use. So, after a week or so, I must dismantle the pit and push all the pads back into position, which takes about an hour or so.

Would it be advisable to build a small wall behind the pit to stop it from sliding back? I've never had a vaulter go off the back; it's a big pit.

I can add pictures if needed.

[vaultdad]

Sounds like a job for a row of sandbags.

Walls or any structure at the rear of the pit are generally considered no-no's for safety.