Backing out from under a load after you've set it down, is another good reason for the front-suspension lockout. Those first two pallets I unloaded without the lockout... before they lifted up off the truck, after I had the fork positioned, lowers the operator before the load lifts. Hard to tell the difference, from the cab, between lowering it enough, and digging the mast into the ground, when unloading. So unlocked suspension, you back out from under a pallet, the truck wants to spring up. So the forks want to spring up, even if they're pinned, they're still gonna flex and they're kinda long, right? The whole lockout's an obvious after-thought kludge meant to avoid the various problems I ran into that first evening, operating without the lockout. But it's obvious to me, now, why that system was retrofitted. Yeah, you need it, IMO.