Thank you all for the tips and info, they were very helpful and helped me decide ..... 3000 Btu/hr is the way to go. I like my local mountains and they can get very cold.
Fortunately, I now see a newer version of this portable heater that has ignition button, no matches ... Yeah ! and two heat setting another Yeah !
Amazon has it for $39.97 $0 shipping $0 tax so I bought it.
This link shows the newer version, new to me anyway.
I estimated that the 1000 Btu/hr SportCat is about equivalent to a 400 watt electric heater, using propane
as the fuel. It would take a 3000 Btu/hr Cat heater to get close to most small electric cube heaters. If this new model really has a low output setting, it will eliminate over venting the trailer in order to keep from cooking myself.
Many units like the Mr Buddy will not work at high elevation, I understand. The portable Coleman will eventually be replaced with an Olympic mounted someplace and connected to the trailer propane
I too don't like the waste of 16oz propane cannisters, that bothers me a lot more than the cost, and will see how to get hooked up to the trailer propane, might require an additional regulator, if not I'll hurry up and get the Olympic and use the portable for other things like keeping me warm when I am cooking outside.
Thanks again, appreciate your valuable ideas and suggestions.
Santiago in Anaheim