If the body is rust free then everything else can be replaced reasonably...
If you do it slowly
If you are in a rush then the costs can spiral to very expensive quickly.
Up here parking a rig for 10 years does nothing to them,unless you get some rodent damage.
Being in Arizona you have a dry climate as well, so i would not write it off.
Wiring and vacuum hoses are cheap items to replace if you do it yourself.Lots of information as to where the hoses go and wiring is easy with a solder gun and heat shrink to do it properly.
My brother has a 86 Chev 1/2 ton pickup he bought new. 400K KMS + on it . It sat for over 10 years,he rolled his truck and got a broken neck out of the deal.He needed a st of wheels so i put a good battery in his truck checked the fluids and hit the key. After a bit of cranking it fired on the old gas and never looked back. Aired up the tires and had to change one which would not hold air. He drove it for a bout a year and half before he bought another truck and parked the 86 again.
I would not give up on a truck i bought new unless there were rust holes through it