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Here's a link to the mounting tray from Cool Shirt FYI. Not inexpensive but quick easy way to get the mounting done if you don't want to fabricate anything.
I’ve got that tray and love it because you can open the cooler and add ice without removing the straps. ...unfortunately the series I’m running in makes me put a ratchet strap over the cooler in addition.
Then how is the tray itself secured? With additional bolts through the eyebolts into the side flanges of the tray using conventional bolts?
Originally Posted by dasing
The corners of the Coolshirt tank are rounded. So if you put the bolts through the bottom the of the tray, but in the four corners, then the tank won't interfere.
PS Now that I look at the bottom of the tank, I see it has feet on it. Those would help too.
Originally Posted by Thundermoose
Here's mine. I have a carabiner to make it easy to remove.
Mine is a hybrid of these two. I have the tray bolted in the corners with fairly small bolts. I use a strap like Thundermoose's with S hooks attached to two eye bolts. I hate the straps that comes with the tray and this holds it really tight.
I used M8 bolts with washers in the corners of the tray.
I cut the bolts to the minimum length needed to avoid the additional protrusion under the car.