'We do 'temp' poles (2 or 3 2X6's) 20' (3-4' in hole) which is acceptable by our two POCO's. The hole is the hard part, but a two man post hole digger (rented) helps.
We use a pole contractor to set 'normal' wood poles. Lamplighter Electric in Morris County, as that's his "thing" with the digger derrick truck. We do light poles up to 40' with our bucket truck; taller ones use a rental crane.
Here in CA we have companies that specialize in temp power for construction sites and other temp wiring. Also some companies do complete construction rentals including temp poles, porta potties, offices and fencing. Try looking under construction rentals in the phonebook.