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I just pulled my cam to replace all the bearings. Are you saying I should clearcoat the cam, or the bearings or just use wax?

Why chance all the bearing if just one is the "issue"? Why was there a change in cams?

Both the air compressor and the IP get oil from the front cam bearing source. When the truck is shutdown, the oil (contaminated) could drain back and "wash" or contaminate that bearing. Just a possibility.

It shares a connection with the IP. Perhaps a fuel diluted oil supply(from the HH or orings) could cause wear on that bearing, allowing accelerated wear. Maybe the original cams had a failure issue, and that is all it is. I doubt we will ever know for sure.

Also notable is the fact that the parts listing says that there is a replacement camshaft and gear that replaces an earlier part number. CAMSHAFT,ENGINE REPLACES OLD 1 CAMSHAFT AND GEAR And, it's made by Hercules. http://www.parttarget.com/2815-00-808-6978_2815008086978_10951216.html

And interestingly, the camshaft bearings are not all the same. Each has it's own part number. BEARING,SLEEVE:CAMSHAFT REAR 10910980 (19207) EA 1 SEE SET 17 1 3120-849-1030 KF H ZZ BEARING, SLEEVE:CAMSHAFT REAR INTERMEDIATE EA 1 SEE SET 17 2 10910979 (19207) 3120-849-1030 KF H ZZ...

Something like this?

Also, is there any indication of gear wear on the cam gear or the one it mates with?

Have you measured all of the cam bearings? Is the front one the only one with that much clearance(wear?) Any out-of-roundness?