There are several posters here who have done this.
This is the only thread I can find with limited time to do a search of the past threads - but there are links included to earlier threads also.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28166710.cfm
The measured current consumption appears to be of the same order as those electronic coolers people buy for their cars, it is not as hard as it may first sound.
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Ford Explorer or Chrysler 300C to tow with.
Tracer Air 238 to be towed.
Triumph Thunderbird Sport - with the toy-hauler gone it's at home.
Retired very early and loving it.