Black is still common as far as I know bit tests purely from my experiences.
Regarding ground access rails for airlines and electrical leads these should be made standard for all trailers. So so much easier and safer.
Then again there’s loads of things which should be standard whether they be required to be retrofitted or not such as automatic park brakes on trailers where as soon as the red line is detached the brakes are applied.
Terry Cooksey:
Most modern fridge trailers have their sizes on a rail that can be slid to either side to make coupling or uncoupling possible when standing on the ground, removing any need to go up on the catwalk at all
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Most are but even when fully over it’s often almost impossible to get enough force behind it to get the inner airline on unless you dump the pressure first.
A gym membership would probably be beneficial for you then