Also, since it's not a pressure vessel, it can be easily repaired. If it's cracked, just get the crack realigned (if it's displaced, you may have to push it out from the inside with a stick...) then either smear epoxy or polyester resin (Bondo gel, fibreglas filler resin) over it.
If it's bad, get a fibreglas kit and cut a patch to fill it in, and resin inside/outside.
Sorry I can't give you advice on how to remove the tank - but I don't know the KJ, and don't like how things get hidden on new cars anyhow.
For the lines on the bottom of the tank, I find it helpful to secure them using zip-ties, pulled nice and tight. You have to cut them off, but if you're going to cut them off, the hose probably wants replacing anyhow.
(Finding a screw hose clamp that small probably isn't very easy...)
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