Portable garages are most often just things that are used for temporary setup either while something more permanent is being constructed, for a seasonal occasion, or for something that doesn’t require a full on set up and can withstand the elements in whatever climate or season you’re currently in.
Portable garages are also things you’ll find at roadside fruit stands or for other occasions where people don’t want the weather to affect their overall ability to be in place selling their product. One occasion is homemade ice cream that people keep in portable freezers and sell on the roadside in the summer. You don’t want to not have your product available just from a little shower; for this reason portable garages are a great idea for such an instance. Also around Halloween, if your family’s got a popular pumpkin patch on their land you’ll want to have a portable garage set up so that people can pay for their pumpkins on their own schedule, even if there is a little in climate weather. What many people do for such an occasion is that they will set up an electric portable heater so that a representative from the family can stay out on the pumpkin patch even if it is a little colder than they might like.
For a more semi permanent setup you may see portable steel garages, say at a construction site where the foreman can lay out plans and have discussions away from the noise of the construction site and away from falling debris. While you certainly have seen these types of portable steel garages that they are here today and gone tomorrow and construction site says was the construction is wrapped up the portable steel garages disassembled and they move on. So while you may think you just saw ghosts it may just be the fact that there are construction sites that have needs which are in flux.
If you are trying to figure the best type of portable garage you really need to determine what your needs are. If you need a portable carport garage that is one thing and it really depends upon the permanence of the carport; however tedious need a seasonal fabric tend to garage then that is a complete other thing that requires other needs. But once you determine the size and the need of the garage then you can begin shopping for your portable garage and find out which one is best for your needs.