Here's a thought, have you guys considered doing some marketing? Microsoft is the master of this trick, but it IS a fair statement. The process is called FUD. Fear, Uncertainty, and Doubt.
Microsoft killed off a load of competitors by paying folks to write up stories like how early competitors to Word may not work on the next version of Windows (And therefore you could lose your documents). They are trying to do the same to Linux (but too many people know that sites like Google, Ebay, and Amazon are all Linux based b/c windows can't do the job).
You could hit the following talking points:
Your equipment is safer -- This decreases the likelihood of an accident which means more on-time deliveries.
Your equipment is greener -- This can be used for their company literature. You could provide improvement measurements between the mexican rules and the ones you must obey.
Your team has more experience on US roads
Your bring local jobs -- Ok, this is for your local goverment when you are looking for tax breaks.
Don't you guys have an industry association (textiles does)? You could pool some resources together and get a marketing company to come up with some fancy literature that you could customize and use to go after your old customers as well as new ones.
J