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Wondering how to go about drilling the holes for a head cab to receive a Trinity 18W chassis. The square cage nuts are a good idea. However its difficult to mark up drill holes when you cant access the the square receiving holes when the chassis is in place. I'm guessing this question has been asked before but couldn't find it in resources or using a search. Thanks. Dave

The drill hole spacings are 19 1/4" x 4 5/8" for the 4 corners. Diagonal dimension to drill holes is 19 3/4 " to ensure its square. At least this is how it is for my Trinity 18W chassis.

Hi Dave! You seem to be up against it. Using thin cardboard or a template to match with the chassis and mark hole positions may help. You might also loosen the chassis to access the alignment points without removing it. I wish you luck and the right answer!