This was my solution to not wanting to dig a foundation because @ the time we had a lot of stuff on the propertythat was already in a fixed location & wasnt getting moved to incorporate something else on the property.
My wife got me a greenhouse kit off Amazon for my birthday a few years ago. And after kicking around different ideas, I decided to refinish an old spare trailer frame my father in law had sitting around. Sanded the trailer frame, repainted it, put down new decking & then started to build.
Its a 10ft x 7ft greenhouse setup.
I decided to put the GH on the trailer so that if needed, I could chase the sun around with the GH being on the trailer.