I'd simply suggest to anyone who plans on owning a tractor for any lenght of time to buy the fitting, the hose, the right pump, and a barrel to pump in/out fluid from tires. You'll end up using it several times in your lifetime, trust me. The convenience of having it handy will offset the purchase price, let alone the actual cost of having someone else do it for you.
I bought a Teel chemical pump with garden hose fittings for under $60. Got it through W.W. Grainger. It's stainless steel with a rubber impellor. 2 rebuild kits come with it. In 5 years, I haven't had the need to rebuild it yet. (Probably serviced 15 tires in that time) Fitting from NAPA around $18, and a couple 3/4X25' garden hoses, plus a 55 gallon plastic barrel, and you're in business.
TSC sells a pump IDENTICAL to my Teel. (Saw one there 2 days ago)
By having the equipment handy, when you know that you have a tire going down, jack the weight up off the wheel, and pump out the fluid (whatever you have in your tires) and save it 'till the leak is fixed. Then pump it back in.
BE PREPARED.
JMHO, and worth all you paid for it.