Wayne,
These devices were never intended for the application you are attempting. Beer distributors use these all across the country at major special events to dispense 100's of kegs within hours. They have used these successfully for years and have no issues other than neglecting to clean them from time to time.
They were never intended to be used for overnight or day to day events where the volume was to be relatively low. Even cold plate systems were not intended to be used from day to day.
Again, if the Moosehead has approximately 2.5 vols. of CO2, and if the keg beer temperature is 60 F, you would need 23 PSIG to gain perfect equilibrium such that the gas cannot leave solution or the beer absorb excess solution. Not knowing what temperature your beer is at, but guessing that it may very well be 80 F (lots of ice on the coils!) if it is simply sitting on the sand at the lake front, you would probably need close to 34 or 35 PSIG to gain this equilibrium.
A suggestion would be to use blend gas and simply risk the beer going flat. If interested, let us know and we'll fill you in. As to providing instructions. We would be happy to other than to do so for every situation that these devices may be applied to would create an instruction encyclopedia versus a simple manual.
Scott Zuhse, Instructor
Micro Matic Dispense Institute