>Conclusion: The easisest and most effective 
>alternative is to stay at an RV Park and run an electric heater. ($30, 
>plus $15/night), but this won't work on cold evenings at a trailhead...

No good either. For winter use, a 110 volt heater is not adequate to heat
the interior to comfy warm conditions--the BTUs are simply insufficient, I
have found.

>Note on heater safety: my CO detector triggered 3-4 times; always due to 
>idling of the engine in the morning....(don't sleep in your car with the 
>engine running :)

exactly what I have found too
___________________________________
Derek Drew                           New York, NY
drew@interport.net (main address for e-mail)
derekdrew@aol.com (alternate/backup address, checked infrequently)