[Aussie Mike]

Re parking tuck and trailer in there. Had you thought of making it drive through? My neighbor across the road had a tipper truck and dog trailer he drove for ready-mix and his shed was set up drive through. Dead easy for him to park the truck and drive straight out the next morning.

I'm running 2x 22,500L tanks on the shed and another 20,000L on the house. Got a similar gravity feed system on the house tank. All the down pipes have a head of water and we collect off the whole roof. The 20,000L house tank would supply us just fine for all water for a family of 3. We've switched back to town water and the tanks are just for irrigation now.

Cheers