Your refrigerator running on electric can consume about 3-4 KW per day!
Make sure that the refrigerator is off, until about 1 day before packing for a trip. It will cool on gas much faster than running on electric.
ALso your battery will consume about 40 amp hours daily (at 12 volts), or about 500 watts per day. If you unplug your RV, you risk the batteries going bad, and that will be nearly as much as your entire electric bill. So I would leave the RV plugged in, but shut off the power consuming refrigerator and propane leak detector. This will reduce the RV's power consumption from a potential 5 KW daily to less than 300 watts per day.
Your old tower computer can also consume a lot of power. While a laptop will normally only use about 20 watts, the towers normally came with a 250 watt power supply, and if using a old CRT tube type display, it can use an additional 200 watts! Only about 20 - 25 watts for a flat screen computer display.
I saw some 'all in one' computers at Best Buy, where it has a flat screen, with the DVD player mounted inside the screen, and hard drive in the same package (thus all in one package) for less than $500. This would also consume about what a laptop computer would use - around 20 -40 watts per hour, but not have the battery back up, or be as portable.
I changed some of my lighting loads to 12 VDC and used 24 LED panels to light up my house exterior, and I am planning on installing some inside as well, as soon as I figure out where I will be running the wires and stuff.
Good luck,
Fred.