Did you get dual jacks? The few trailer folks I've talked to highly recommend them if you ever plan to unhook the truck with a load still on the trailer.
Also, I assume you checked the width between the trailer fenders and the with over your front wheels of the fire truck? If it's close it's really handy to have removable fenders, are they removable?
Don't forget the pictures when you finally get it and have your truck loaded and ready to go.