I think I've mentioned this here before in passing:
In the early 2000's I worked part time at Home Depot, in Lumber and building materials. My first month or so i tried to help people making mistakes while loading vehicles. I got cussed at, things thrown at me, and the manager called a couple times. Finally, one of the older guys took pity on me and explained the reason for the stack of liability releases kept on the fork lifts.
Two pallets of shingles in the back of that Grand Caravan? Yes ma'am I do see you sprung for the Stow and Go seating. Sign here and I'll load them up.
65 pieces 4x10x5/8 sheets of drywall in that Ram1500? Yes sir, I see that it's 4x4, sign here, I'll slide them right between the wheel wells.
And so on.
Kingcreek, get the cash, put the furniture on the sidewalk, and wish them the best. If they gotta leave and go get help, straps, or another vehicle, that's their problem. Your back is your problem.