Yup. the heater warms it up fast and the soft sides let it cool fast. Lots of folks either fab up some form of soft side thermo liner or buy FWC's Arctic Pack. The programmable digital thermostat upgrade for our vintage FWC'S is pretty popular. If you think propane conservation will be important look carefully at how low it will go. There are a couple of threads on here or WTW on the conversion.
Congratulations on the 1st time out. If your girls are like my boys having that trailer will become key as you'll soon need to haul 3 pontoon boats, 3 sets of waders, 3 pole cases and so on

Thanks for your post.