I use one, it’s slightly larger than one of the small ceramic heaters, but I convert my 8x21’ BP to my LQ (it has a power package and breaker box up in the carriage storage area (no separate dressing room, just stud doors between the back and front, plus it is mostly insulated) so it is a fairly large area and I thought it could use more than a tiny desktop type heater. I also added a dehumidifier this year because my sneaking suspicion was the dampness wasn’t helping keep the trailer warm enough based on the few times I used it last winter.
I was in FL about 2 weeks ago and it got rather nippy so it was a good test. Fri night was rain, rain, rain and then a cold front came in Sat. Friday night I was super comfy in my cot+lightweight sleeping bag. Cool enough to sleep, not so cold I was uncomfortable. Saturday I got a bit chilled in the wee hours. Uh, the explanation for this was apparently I forgot to close the back window, so I did my part to heat the Florida Horse Park. Still, it was a LOT warmer in the trailer than when I stepped outside, so I think it will do just fine this winter. And the humidifier picked up a lot of moisture in 48+ hours so I think it was a good addition.