Need help over exported trucks overseas

Hi
i did buy 2 trucks with Detroit 14L ,(x-ryder) 2005'2007 (milege between 300-700k) and one sterling with MBE4000 around just 200k




my business is based overseas hauling containers ,While i am living in Canada. Spare parts must be shipped from the US.


and i am finding trouble of creating a list of most important items to buy and keep on shelve if needed




i did follow. Many threads here and was able to make the EGR mod. On the Detroit engines only .


Fuel economy is not a concern as well the emission i could just remove the entire exhaust if needed.


By the way , my drivers hate those truck LOL, So stif on the body, noisy engine ,hard clutch etc, and i once had a hard time finding a mechanic to work on the brake (no one want to even touch it)


could you please help me with that


many thanks,