Looking at purchasing a "portable garage" (aka, tent) for temp storage. Any recommendations?

I’ve used the ones that Costco sells, they work very well for what they are. They’re quite sturdy and come with all the anchors you need to hold them down. I had mine bolted down to a concrete pad, so it wasn’t going anywhere. The roof would last about two seasons before the sun wiped it out, they used to sell just a roof replacement panel for them so you could just buy that a heck of a lot cheaper than buying a whole structure again just to replace the roof panel.

I wasn’t using it where snow was a problem at the time, I think the instructions say they’re not rated for any kind of snow load.

For a few hundred bucks they’re a good option for keeping a car outside and relatively out of the elements for a few years, but that’s about the life span of them