Plastic or fiberglass will keep the ground water out, BUT you will want to keep it full. During heavy ground saturating rain, they could float up. I would keep the tank in the basement also pumping from one to the other with a float.
I have a 200 gal tank in my basement that I slow fill from the well then the house pump can run full power. I can drop water into either the well or the tank via piping and quick connects at the back deck. My truck tank is 350 gal. I usually have to haul water 5 months out of the year. A thought full setup is the key to ease of use. A caveman could fill/run mine. Apologies to all the cavemen out there.
