Used furniture moving dollies should be available cheap and readily adaptable. Or just attach wheels to a rigid plywood bed sized for your soil bed.
Indoor Atulip's Auto Adventures
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Yeah I ran the numbers for it, Grassroots bed is a little shy of 2'x4'(22"x46"x18") and at a maximum will hold 70 gallons of soil. It should weigh around 350 pounds moist. I found an 800lb 30"x18" dolly at HD for $16, attach it to $6 worth of 3/4" plywood and add a $20 dolly handle to it and you've got a mobile platform for under $50.
Take it a step further and screw a 2 by 4 frame to the brim of the plywood, add pond liner to it, fill it with perlite and you've got a giant mobile earthbox for around $100(+$100 for the grassroots bed).
Or consider garden carts. Could a fabric walled garden cart be used as a bed, filled with soil/media? For ex., could this be filled with soil/media and used for our grows? -- https://www.homedepot.com/p/Oumilen...on-Portable-Garden-Cart-HD-701-WELA/333382341
Or could a heavy duty unit with steel sides be adapted, such as https://www.walmart.com/ip/VEVOR-90...Mesh-Removable-Sides-Convert-Flat/16552862542
Or could a heavy duty unit with steel sides be adapted, such as https://www.walmart.com/ip/VEVOR-90...Mesh-Removable-Sides-Convert-Flat/16552862542
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The first one could probably be used as a small fabric bed(about half the cu ft of the grassroots 2'x4'). Second option is just as pricey as making your own with built in sub-irrigation though, but would be closer to the same cubic feet if you built an 18" bed on top.
From what I understand though the grassroots pots are better since they don't dry out along the side walls. Though on a wick bed that may not be an issue.
This is the 4'x8' wick bed I had... 9 years ago... Just some EPDM pond liner stapled to a 2x4 frame, filled with perlite.
I used to just cram them in there sea of green style in 3 gallon pots... about 1 per square foot, all autos on a perpetual cycle. Only watered from the top initially, just filled the bottom wick bed and let them ride. Water only coots soil.
I'm hoping for similar simplicity but this time on a whole 70 gallon fabric bed, maybe just having to top water a bit when applying castings and nutrients.
I'm leaning towards the 6 foot by 3.5 foot by 8 foot tall tent more now. Doing all the math, a standard 78-80" high tent only leaves about 2.5 feet of plant height allowed, and I have no idea how tall a couple/few autos will get in a 70 gallon bed... my experience is mostly with 3 or 5 gallon pots, even then they reached that height regularly for me.
Bonus, here's a shot of one of those old $50 mars blurples I started with I converted to Cree cobs later.
I'm a duct tape engineer.
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