One problem, however: one of the 8-packs was trapped on the top overstock shelf in the store, buried under a bunch of other rack material. While I dealt with the Head Cashier to "return" the ten original beams and pay for the entire lot, the manager had one of the other staff bring a portable lift over to the shelving area.

Standing well back behind the temporary safety barriers, we watched as the poor Lowe's associate struggled to move the shelving material from the top rack and to free our beams. She just barely could manage it, and there were times when it looked like some of the shelving material was going to come crashing to the floor (a good reason to stay back!); however, after 20-30 minutes of struggle, our beams were free. Of course we kept them in their 8-pack wraps as Lisa and I hefted them onto a cart. They're fairly easy to move with two people, but terribly unwieldy for one, especially one person scrambling around three stories off the ground (she did have a safety harness) trying to shift hundreds of pounds of other overstock rack material.
We got the rack material home and unloaded with minimal issues. With the small racks and a pallet of boxes moved to the locker, Lisa has almost managed to clear enough space to be able to put the Small Orange Pickup back in the garage. I helped her move one of the pallets on which we'd been temporarily storing boxes out of the garage and onto the pile of pallets outside. We shuffled vehicles so that we could move the Rolling Stone back to its space within range of ground-side power; the RV shop had accidentally left some of the interior lights on while they did a separate repair to the refrigerator in addition to installing the steering stabilizer, and we want to make certain the batteries are fully charged before I head off to the Bay Area for a two-week stint tomorrow.
That was a very productive Friday the 13th for us.