Sorry for the double post - but I just recieved a reply to the email I sent Tru-Cool. This is the answer I recieved:
" These warnings come from both the Hose Manufacture and the Cooler mfg.
Double clamping can cause bubbles / squeezed - pinch points inside of
the hoses, which can lead to premature hose failure."
So I guess I answered my own question. Hope this helps others on this forum.
Jeff