Driving long distance with a tank in the back of a vehicle.

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I will be in Vancouver next month and I expect to pick up a tank somewhere in the 50 to 75 gallon range and drive it back home 2 days drive on the highway. It will be in the back of an SUV.

I figured to prevent damage to the tank I would buy some 3/4" plywood to make a base for the tank to rest on in the vehicle, then I could tie the plywood into place securing it to the vehicle interior, them use duct tape or similar fastener to secure the tank to the plywood base. I want to avoid getting home with a broken tank.

I wonder about rigging up some kind of shock absorber under the tank such as some foam material, if anyone has done a similar move before please let me know what you would recommend.