I used two quonset hut style units for almost 7 years to store two of the Newps.
They were top end quality wise, and price wise as well. The HFT unit you linked is low end junk that won't last more than a couple of years before it is compromised. I paid $850 each for mine in 2004 and 2005.
The frame was galvanized fence post and the cover was heavy duty rip stop poly. They came with a ground cover and I paid more for a roll up door kit.
They worked great for what they were and held an incredible snow load. I even disassembled them and moved them from one location to another.
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But there are two major weaknesses with them:
**THEY OFFER ZERO SECURITY AND ARE HIGHLY SUSCEPTIBLE TO VANDALISM**
As fate would have it, I had a shady neighbor move in at my last shop that instantly took a disliking to me. I tried many times to make peace with him to no avail.
One day I got to the shop to find the following:
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They left a sample of their DNA here:
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The convertible now:
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My truck and enclosed trailer got it too. But, I had enough previous police reports, history of trouble, and DNA from the roof of the green 4DSD and a bottle that he littered the lot with to have him arrested, prosecuted, and convicted.
So keep in mind that portable garages are great until they aren't.
If you do decide to get one, definitely use a ground cover. Bare ground will result in a humidor with condensation running down the inside.
Everything I own is now inside a secure shop.
Hope the input helps.
John