Sara -
Yes, you have everything right, and BillAndSue are giving you the right advice. The installer should be very willing to balance them for you - you should insist on it, and expect to pay a few bucks. Some old-time tire shops will tell you "We never balance trailer tires". Unacceptable. Insist.
As long as they have the tires off the wheels, you may as well have them replace the valves. It is easy with the tires off, and the cost is minimal. You want bolt-in steel valves. If you have 14-inch (load range C) tires, replacement is optional, since the tires will be inflated to 50 psi max, and rubber valves will take this amount of pressure. If you are installing 15-inch (load range D) tires, insist on new valves, since they will be inflated to 65 psi, and a rubber valve is iffy at this pressure. And even if you will have 50 psi tires, you might as well have it done, since you might decide to switch to 65 psi tires at some time in the future.
Bill
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