Can someone measure this for me please?

[SnS C10]

I will be towing a 1972 gmc longbed half ton on friday with my 03 silverado. The gmc will be on a uhaul car hauler, so all four wheels will be off the ground. A little worried about the width of the front as the trailer measures 75inch wide. Can someone measure the distance of the outside edges of the front tires with stock tire and rim size on a similar truck? Thanks everyone
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