I took my old mule to the graveyard last year, '99 GMC 445,000 mi - I made del to all GM and Ford plants both US and Canada. That is a myth invented by some carriers to make them look good on your expense. That is the same situation with those telling to buy a Sprinter to get contracted. They do not invest a penny.
That is not a myth invented by some carriers to make themxelves look better. Why do you think the reputable companies require newer equipment. It's more likely that no one at Ford or General Motors has questioned the age of your van, but every time you are awarded a load from NLM from thos companies, it clearly says that Ford and GM do not allow equipment older than 10 years on their property. If you don't believe me just ask them.
Here is what it says when you win a GM load.
GM safety requirements do not allow any equipment over 10 years old in their locations and require that drivers follow all safety regulations at their locations.
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Sure older vans do deliver to the big 3, but they are technically not allowed to, and if that carrier gets reported they can lose their access to those load opportunities.