Your outside indicator lights are not usually on while camped, though some people have an accessory that allows them to be used for decorative lighting, so you can skip converting those for energy savings. Some have changed the running and signal lights to LED fixtures for better visibility, but that's a different issue. As others have said, do an energy assessment - and consider just how you need to use power, and how you can change habits, if necessary. We often base camp for 5-8 nights, in all sorts of weather and times of year, so being able to charge batteries is necessary. With our Coleman Cobalt pup, we had a furnace and two 1-bulb inside light fixtures (plus the CO detector), we changed the bulbs to LEDs. Often, we only used one fixture for most of the time we were inside. Our group 24 battery would stay above 70% SOC even on the coldest/longest nights (50% is the level most recommend staying above). We chose to go solar, since we tend to camp where it works,well, it's great just to put the panels in place and let them work, and we've never had space to tote a generator. The TT has more stuff, and came with a group 24 battery. Not sufficient as it was, and we had a defective one - made figuring things out interesting. Yes, the water pump seems to be an energy hog - we noticed the difference on our first trip this year, when it was cold enough that we did not use the water system. We now have two 6-v "golf cart" batteries; DH had to construct a holder to make that work on our crowded A-frame. (If the LP tanks had been installed 1/2" more toward the nose, things would have been easier.) We have three 2-bulb ceiling fixtures, and a couple of 1-bulb ones (all now LEDs) - we generally run one while dry-camped. We changed the porch light and work light on the front to paddle LEDs, partly so the light could be directed where it would do the most good. The water pump, 'fridge and hot water tank brains/igniters, LP/CO detector, and furnace are the usual power users. There are vent fans in the bathroom and over the stove that get short, intermittent use. If we charge the Kindle or phone from the TT power, we usually do so in the daytime, while the solar panels are charging the battery. It's usually topped off by early afternoon (or sooner) so we don't actually drain power we'd use that night. We also have a separate storage battery we can use to charge those, as well as run a fan or light anywhere in the campsite we need it. Since we still have our original set of solar panels, we can recharge that, if needed, separately from the TT battery.