I even do abit more in that I very seldom crank up the thermostat on the electric heaters much above 50%.
Running full "ON" they all get very hot and the electric cords also get hot... To me you are just flirting with disaster.
We use the oil-filled electric heaters all the time in our trailers unattended. Great back up heat source. We picked the oil-filled type heaters for their inherent safety feature as there is no visible open flame or red hot cores, no burnt dust smell and they also are very quiet with the only noise you hear is an occasional click. You won't have to worry about a mouse on fire running around the walls of the trailer
We use the standard tall oil-filled heater in the big trailer and the low profile ones in the POPUP trailer. Over the winter months I have these set for a #3 setting and plugged into one of those THERMO CUBE electric adapter. These will turn on when the temperature gets below 35 degrees and then turn off when the inside temperature get over 45 degrees.
Roy Ken