There has been quite a bit of discussion using LED's to save power when boondocking. This might a partial solution for some. Have never seen this mentioned before so I pass the info along for what it is worth. I have no connection with this company and have never used their products. I understand that 2009 model Casita trailers will come equipped with these.
9760-88 - Utility, Interior and Work Lamps Heavy Duty / Commercial Vehicles