While enjoy a few drinks at a football tailgate during the Fall of 2008 season I had one of those light bulbs light up over my head! It seems a lot of my ideas show up while consuming beverage.
Some Frat guys at another tailgate had a truck bed full of cold water... They thought they were the smartest guys in the world. So I decided I could out do the Frat guys. Being that I live in Montana and the weather dips well below the 20's in November I had a challenge. I started acquiring parts from all over the place. I got a 150 gallon stock tank from a buddy out in Minnesota when I went to his wedding. It measured 4ft Diameter and 2 Ft deep. It fit about 3 people comfortably and 6 uncomfortably!! We used this small hot tub the first year and upgraded this last season for a 9ft Diameter hot tub! Go big or go home! Enjoy!
Living in Montana has its perks. One being friends that have farms and trailers you can borrow for free, and two, local Ranch supply stores that will let you buy and return 1000 gallon stock tanks!
The tank is a cattle stock tank. We had maybe 750 gallons in it. Don't over fill it or else it will overflow everywhere when people get in it. We had to ratchet strap it down with lots of straps. And to prevent to much sloshing during transportation we had to strap a few boards onto the front and back.