I just tell them, which was very often, that I had a special way of packing my equipment and everything had a special place that it went or it wouldn't fit on the cart. Then I thanked them for offering and went about my tear down routine, which takes me about 6 minutes at most.
All the best,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)