In my travels I see RVers with tomato plants, house plants and a variety of other fruits and vegetables. They are usually stationary for a while, like campground hosts or work-campers, and they manage to keep a garden. Here is a portable solution for a care-free high-tech growing system that controls soil conditions and doubles the yield of your crop with less fertilizer, less water and little effort. There is no digging, weeding or guesswork. It set’s up in minutes and can go anywhere. Here is a link with more information Earth Box . It costs around $65.00 or you can make one yourself for around $10.00 Do It Yourself Either way you will get more bang for your buck with this type of gardening system.
For you snowbirds with a green thumb who like to grow tomatoes and flowers in the desert but find it difficult because of the nighttime freezing temperatures, Flowerhouse 
The night before last our exterior water hose froze and that would ruin a nice tomato plant unless of course you had one of these. This is the clear “Planthouse 5” and costs $159.00 delivered. 
The wind here routinely gusts up to 25 knots or more and this greenhouse stays right where it was planted, held in place by stakes. 
Flowerhouse carries many different models and sizes. They are all portable and can be assembled in less than five minutes. Here is the website: 
If you want to order these on the internet here is a dealer with free shipping: 