You guys may already know this, but if you need/want to have spare Trimark or Global Link keys, take a look at
Easy Keys. Basically, you just choose the key brand, and input the laser etched code on your current key, then place the order. Be warned though, keys from them are going to run about $8.00 per key.
With my last coach, other than going to a locksmith, I found that the big box stores did not carry the Trimark blanks, so I had to order them from a RV supply company. So by the time, I order the blanks and take them to someone to cut, taking a chance they would cut them correctly, I figured, the price would wash out.
Anyway, this may be a service that may help some folks...