Blazon: Per pale argent a cross of Calatrava gules and vert two bars wavy of the first, in chief a beehive between two bees displayed and in base a sheep statant or
As you might expect from the charges, both agriculture and beekeeping are extremely important to the municipality, all the way back to its founding. The very first settlers were apparently beekeepers and ranchers, so while it might not be particularly exciting, I can’t really fault them for using those as charges. (At this point, I’m more surprised I can’t find anything that claims the bars wavy symbolize two rivers in the area, though I definitely wouldn’t rule it out.)
Blazon: Gules a bar wavy azure surmounted by two logs raguly palewise in fess argent
These may possibly be canting arms (“Stumpf” meaning “stump” in German), which also incorporate elements of the arms of the former municipalities of Weipertshofen (the fess wavy) and Rechenberg (gules and argent). I should note that this is all speculation.
Blazon: Per fess sable charged with a bar wavy azure, I per pale gules a tower or windowed of the second and of the third a Maltese cross argent, II of the second a wall of four towers of the fourth windowed and masoned of the first
The wall in the lower half of the arms presumably represents the local Roman observation tower. The town’s name derives from the sandy terrain (arenales) and its history with the Order of St. John, which is likely the source of the Maltese cross.