Burbman...your sand compacts better than the stuff I normally run on.
The sand am used to would NOT leave such distinct tread pattern. It would fall apart, unless wet.
Wonder why east coast sand isn't rounded by eave action as much as out here on the west coast.
The 'apparent' diameter am talking about will on additional tread contact in length. Measured at the leading to trailing tread contact. That is more important, but bulge width and cupping also plays.
The minimual tread penetration on your current tires look very good, considering loaded with that camper n stuff.
Cleaning out the garage attic and found my old surf rods. Gave them away except for my first rod I made as a teen.
Fenwick fast taper and has been rebuild several times. About 12-13 feet with extra long handle and larger diameter cork.
Mainly strippers with occasion gulls hitting the metal spoon (Mickey Mouse, with a hulla skirt)...