The 2 prolawn zero turn sprayers have 30 gal tanks. The push sprayer has an 8 gal tank. These sprayers are low volume, so you can spray approx. 10 gal per acre if needed. I usually sprayed 2 acres between tank fills. These sprayers are nice because you can spray when it is windy out (which is a problem for us in oklahoma).
The hps is just a spreader, but I think they make a tank and boom system for them.
...as for me and my house, we will serve the Lord.