I back my machine in, and the 3pt is raised to keep it above a bunch of stuff I have on the floor in the very back. I've been planning on building some shelves to put things above the 3pt and keep it lowered when backing in. I may do that on my next trip.
Since my container isn't level, it's hard to make good shelving inside it. But I could count links and just hang stuff with some lags in the chain where I wanted them for the time being. I have a spool of chain I was going to use for life lines, but I've been using the seatbelt straps instead.