Why not get the plans for a home built hard-side pop-up or teardrop trailer and build your own, or get a utility or camping trailer and modify the inside to what you want? Very high winds may make them unstable while moving or parked, but good tie downs will help. You can the "shelter" within reason where you want, or leave the area with a reasonable amount of supplies if you need to go.
I've a trailer that is loaded if I need to go, and will support me for several weeks (and then some) if I lose my home.
I built in baffled tanks for 80 gal truck fuel, 100gal fresh water and 120 gal grey water in my trailer. I used a 6000 pound axel, with elec breaks and that uses wheels and tires that fit my tow vehicle. The trailer has a steel locking gun cabinet in it for valuables, firearms and ammo. A generator, propane stove and oven, awnings and bunks with storage were all added. It's not pretty, but it fits my needs.