On Sun, 17 Jan 1999 15:27:45 -0500 (EST), Rick Davis wrote:
 

My policy is to not leave the trailer plugged in for several reasons.

West Marine has a charger that checks the battery level every second or so
and charges the battery if it has dropped below a certain level. It goes
for about $100, less on sale. Our boat battery gets the trickle through
this controller and the battery lasts 5 - 7 years.