I use a 100 gallon skid. Most of my lawns are 1/2 acre or less and it would do me no good to ride around with 300-500 gallons of a mix that is specific to one lawn. As I said before, I do liquids because of the difficult requirements of each lawn.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738