pickup tire/light trailer tire spec'ed hubometers, do they exist?

[GM Guy]

hey guys, dad just bought himself two trailers for a tax write-off, and since they are new (actually one is demo'ed) we would like to keep better track of maintenance, so I was wondering, do they make hub-o-meters (the odometer that mounts to the hub, seen on big fleet trailers) for small tires such as the 235/80R16?

if so where do I need to go?

 

[BudTX]

This might be what you are looking for:

http://www.accutrakdirect.com/servlet/Categories?category=Hubodometers:Integrated+Axlecap+Assemblies

 

[GM Guy]

that is it!

thank you very much!