One of the most annoying thing for truckers is to have breakdown and you need to repair the truck immediately, lest you do not get paid. If you have perishable goods, the goods for delivery might rot and decompose.
The alternative to this is to buy brand new trucks (which the people here can not afford) build your own repair facilties: with parts inventory, technicians, machine shop.
Here we can see that numerous technicians and machine shop make emergency repairs possible...