I'm trying to recall Coffeyville from my perforated memory, my wife performed there years ago. Seems there were some commercial nurseries and a bit of pecan growing where someone would have the capacity sprayer that's used to biologically treat stuff, high stuff. If you have numerous trees or the problem is significant (tent caterpillers aren't deadly to the tree) I'd get the phone book out and ask around. A hose-end spraying rig won't get you the coverage you need and I can't recommend you climb w/ a pump sprayer, although I've been known to try that.
If the webs are concentrated I've also had luck with a few sections of a pole saw rig - propane bottle and a torch secured to the end. Webs are pure protien, they ignite instantly without the incendiary side-effects to hurt the leaf. But this approach could lend to some undesired side-effect. Like the reality shows...do not try this at home.
I wanted to ask you about lazer surgery - I'm due for new lenses due to radiation exposure. Been putting it off but driving at night's gotten pretty challenging, let alone bright sunsets while on the interstate. You recommend it? Thanks.