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 pvc 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. Never watered from the top, only filled the bottom wick bed. 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 80" high tent only leaves about 2.5 feet of plant height allowed, and I have no idea how tall 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.
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