NO, NO d did I say NO !!! Seriously, do some reading here on EO. There are some good threads right now being discussed on rates and the over ubundance of vans/sprinters in the market !!!
The only one I have heard of lately questioning age is American Axle. Then it was just the age of the box. 10 years & newer. It's funny though, when they put the loads out for bid they say nothing about it till you get to the guard shack. Then they want proof.
That's why we run for a carrier that pays on % and is totally transparent has to what they charge the customer. On % it makes no sense for the carrier not to get as much as possible for the load !!