They would deflect as much as the straps around your buckets. 24" bar @ 4-6" no problem, anything taller-longer bar 36"-48"
Ok long answer is that with further experiments the buckets are still moving slowly on grass. I don’t think a single bucket full of water is a good solution. It is close so maybe groups of three buckets on grass or rough concrete might work but generally not a solid plan. Maybe buckets of sand or sand bags might work. Mats or chains under car tires seems like a better idea if you have two cars that you can park next to each other or a car with really high clearance that you like to crawl under. Staked down lawn anchors are very solid and work well after a few tries. That is currently my best plan for super simple frames if drilling or gluing to a floor isn’t an option. I don’t have a monster truck currently.
Update
As I am watching it try with ratchet straps around buckets there are more problems than just the bucket moving. The buckets flex and the straps move quite a bit. I think a wooden sled with sand painted on the bottom for friction and then two or three buckets of water on each sled with a solid anchor attached to the sled might work but that’s beyond my time limits today.
This did not work
1.22 did try valiantly so that was cool
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So it thinks that it found a solution and it is letting me drive it around but I would not use this for anything I cared about. Here is 1.22 finding log if that is useful to anyone.
Maslow-serial.log (11).txt (22.4 KB)
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Also I think I need to make a shade hat for my little Maslow. Could probably just use one of those umbrella hats
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Thank you for testing this. That’s been on my to try list for a long time and I haven’t done it because it’s alot of work to set up so I really appreciate you pushing the boundaries of what’s possible so we can all learn 
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