Hey guys I know I got a 15+ but I have done this. Atleast similar.
So I have a 80L bladder behind my rear seat. It literally just hangs/sits on the floor. Nothing too special but it does work when required. You could certainly do something similar for sure.
In fact 5-15 is probably easier (due to folding seat mod)
Only pic is of it out of the car when I was leak testing it. But gives you an idea. It’s literally just zip tied on. As the weight sits on the floor
As for brand I can’t remember. All I did was google water bladders and I think Hilux. Found a place in Vic somewhere.
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