I might be able to help.
Got a couple and this whole region is heavy in Orchards with several brands and dealers that carry Orchard equipment.
Saw that you are spraying 70A.
Forget the engine driven stuff unless you are limited by tractor HP.
They are not especially robust, and can be a royal PITA, especially with the caustic stuff that gets sprayed in orchards.
They are rare around here nowdays, and usually it's hobby farmers trying to get a little use out of somebodys junk from the 70's when they are seen.
If you only have a 30hp tractor, or are limited to a small tractor for some reason, the engine driven jobs make sense. Otherwise they are a headache.
The PTO is the way to go. Either 3pt or trailer. 70A would be a LOT easier and less time consuming with a 2-300gal trailer, instead of fighting to get good coverage with ULV applications and a 100gal 3pt, or reloading a dozen times per application.
Height is determined by Boom height and angle. Jacto and Berthoud both offer boom heights that will work for anything grown.
Retrofit boom kits allow lots of flexibility with hydro controls used to adjust elevation and direction.
Even the smaller Cannon sprayers will provide good coverage to 60-80'.
Used?
Yep.
If you want a bird dog up here I can keep an eye open. Used sprayers are pretty easy to find, GOOD used sprayers are tougher to find.
The good news is the Cannon sprayers are pretty simple to maintain and repair, as well as rehab.
Take a look at Jacto and thier lineup.
Jacto: J1000CHT Cannon Sprayer – Trailer Mount
They are international and do a good job of supporting customers through the dealer network. I'd venture that 9 out of 10 in the field here are Jacto, thanks to cost, ease of maint. and durability.
Airtec is another that is common around here, but rarely come up used unless they are plumb clapped out.
Airtec Sprayers Product Line
Berthoud is another that is sold locally, but they used a piston pump for years and got a bad reputation for the pumps going bad, so they aren't as popular at all.
BERTHOUD
The local Jacto dealer gets used units in on trade frequently, and they make any repairs that are needed before selling.
There were at least 3 on the lot last week.
Holler if ya need.