I kinda like these.Jim
This is cheating. However, I would never crawl under a bus that is supported only by Hydraulic jacks. I once was operating a backhoe and my co-worker was in the ditch close to the bucket, and a hydraulic hose blew and the boom and bucket came crashing down. Thankfully he was out of the way enough that he did not get hurt, but he did get covered with hot hydraulic oil. But for that reason, I never would walk under a bucket of a loader or backhoe after that, as hoses can blow and fittings can fail at any time for a number of reasons. I would also never get in the back of a dump truck under the bed to work on brakes or anything else without first blocking up the bed. But I saw people do that all the time when I was working in construction i na previous life. Gary that not the case with all Hyd leveling jacks some only have wires the pump is on each jack no hoses and they need pressure to retract
Okay. I didn't know that Cliff. But that makes sense. Would it be the same way on Stabilizers on a backhoe?
Old railroad jacks like this one: https://www.ebay.com/itm/324388740054?var=0&mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338590836&toolid=10044&customid=b72cbd6f103f1a51117ed98e5cc0ff67could be usable as a jack stand in the retracted position (not jacked up). I once got a couple of them at a flea market for $20. They have been supporting a semi trailer I have for many years. But personally, I think Styrofoam is the best since it so light and easy to move around.