I built an 8x8 x 6' high cattle panel tunnel this fall, and it survived the tail end of Sandy just fine. I got it buttoned up just before the storm hit. It's framed in on end walls with combination storm windows for doors and ventilation on ends, which are raised up one foot up off ground for extra clearance with snow, 4 mil. poly cover with twine zig-zagged over top to keep poly from buffeting in the wind, cinder blocks over end runners at 4 corners, and screw-in anchors designed for securing a dog run (with steel cable attached to 4 corner runners) just for good measure. This one is for a green house, and can be moved with a bit of heave ho from me and hubby. I may build a second one to butt up to this one for a winter chicken run to attach to my yet to be built tractor for my yet to be chickens. BTW, the last time I checked, I had lettuce looking pretty good in this unheated tunnel in my zone 4 garden.