On the sprinter's we used to run the old tank strap, too. Tank and bladder rested in a cradle, the strap held it in place....There were two bolts, one on either side that secured the strap and tank to the frame...Used to cut these two bolts about half way through with a die grinder, on the first impact when you flip the car the tank would break away from the car. Never liked having methanol running down my neck when the car was upside down!!!! Another scary thing on a sprinter was an oil fire if you kicked a rod out the side!!!! Thoroughly checked the quality of a firesuit on a couple of them deals!!!!!