Everyone I know with an Engel raves about them. Not one has a complaint.
Their claims on power usage seems unreal, but they all insist it is
really as low as they say.
There is another option worth considering on a 26 footer:
http://www.bigfrogmountain.com/engel_products.htm
I have not personally owned one of these Engels but have heard good
things about them. They should not be confused with the smaller,
cheaper chests which use a solid state cooling device. The Engels
have a real compressor in them, and power draw is supposedly
reasonable.