Hello Mark
Hopefully your Colorado has two batteries under the bonnet?
Not all did, hence it can manage with only one starter battery.
I fitted two of these (ebay) and replaced one battery with a Lucas leisure / starter battery
When stopped overnight I just isolate the starter battery and then the whole vehicle is running off the leisure battery. I did run a dedicated supply off the leisure battery for the fridge, one for the extra size cable and secondly to have power without the ignition key being in.
Simple, cheap, easy to fit and nothing to go wrong.
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