My father uses the crawlspace beneath his house as a wine cellar. The problem with the crawlspace is the crawling part. Between the rough edges, the dust, and the low clearance, the crawlspace leaves every visitor filthy and sore from waddling around in a painful squat. To make delivering and retrieving wine a bit easier, my father kept a creeper (the sort of low, wheeled platform that mechanics use to roll themselves underneath cars) in the crawlspace. You could kneel on it and scoot around, and it made lugging cases of wine a lot simpler. It cracked in half years ago from heavy use, with the obvious demand for a replacement just ignored.
This year, I decided a new solution was in order. For Christmas, I put together this customized moving dolly to replace the broken creeper (I gave it to my father yesterday, so it’s safe to reveal now). The base with the wheels is a moving dolly, which you can find at a hardware store. This one is rated to 1,000 pounds and feels sturdy enough to last for decades. By itself, though, the dolly is not an effective transporter of wine. The opening in the middle is too wide for cases or bottles. The center of gravity is also a bit trickier, since the dolly has a higher ground clearance and can be flipped by leaning too heavily on the front or rear edge.
To help with both issues, I built the rig inside the dolly out of familiar-looking scrap wood from Ikea. The slats are spaced close together to prevent wine bottles from slipping through and are bowed downward, preventing wine from rolling off. The additional weight in the middle of the dolly also reduces the chance of tipping it by accident. The rig itself is not nearly as strong as the dolly, of course, but it is completely removable. I made no changes to the original dolly, so you can lift the rig out and use the dolly to move furniture if desired.
You could borrow this concept for all kinds of mobile storage or transportation functions. The whole setup cost less than a creeper would have and yet is more versatile. A dolly can save your back a lot of agony when you’re moving heavy objects. Come to think of it, my cases of cider are just crying out for some wheels.