Went thru the same processes as many getting the food plot implements going. I wanted to spray '10'-12' at a time and be able to get the setup to the plots thru some 4' wide trails. I would not reccomend a tow behind sprayer. Brushhog yes, not sprayer.
I settled on the
[FIMCO 7 nozzle fold-able boom Sprayer] <- there's a link there. I can attest that if it's extended and you misjudge a tree, it'll just fold to the rear - sometimes it snaps back with the spring, sometimes not.. but it doesn't break.
Takes about 15 secs to fold/unfold. It fits UTV's and ATV's. As for the height of nozzels (the important module) that's adjustable with a couple bolts. The documentation describes the best hieght above the foliage to get even spray distribution. It comes with the manafold with three outputs, one to allow backflow back into the tank (that's what allows you to adjust the spray pressure) one for the Boom and and one for the Wand. I like that almost as much a firm titties... as in a whole bunch as my plots aren't "rectangles" with strait lines, I get the majority with the boom, then take a lap around the edges with the wand and hose the areas I can't get - Also good for if you are spraying for invasive plants (my farms bane is Japanens Knotweed) with this setup I can do my plots and use the 75' of wand to get to areas and kill the shit I hate.... But... I digress.
I upgraded my pump from the one that came with the RualKing tank to a FIMCO model. While chores are a part of a habitat mangers life, I like to simplify and reduce time sucks as much as possible. I found with the FIMCO quick disconnect (Pump and Boom Mounts) I can, in military parlance, go from Flash - TO - Bang, as in Start setting up the sprayer with bare ATV backend - TO - fully setup tank/sprayer/boom and ready for juice in about 5 mins. That's a huge time suck saver.
Folded for trails:
Extended for spraying:
Note, once you get your plots going, you'll need a brushhog....
Hope this helped some // Stressless