The plan was to use straps to keep the tank from rising upward or tipping forward. That was well along, with the straps half-way completed before it sank in that far more efficient are simple – and strong – brackets on the ends. These will work as well as the straps, weigh less, and make it easier to install the tank. The concern was that lifting the tank up against fixed straps would be really awkward. This way the tank is easily installed, then clamped into position. There may be a third bracket in the center if framework ends up in that area as part of the emergency brake solution. Might make sense to leak-check the tank soon.