ELECTRIC:
The top priority for electric would be to get a good surge protector that can analyze the power supply. This isn't the exact one we got, but the same idea. They are somewhere in the $300 range. Our RVs have been 50 amp so we got a 30 amp extension cord with 50-30 and 30-50 adapters, since we never really NEED 50 amp. A voltmeter is handy to troubleshoot as well.
SEWER:
The top priority for sewer would be at least 20 feet of sewer tubing and a tank treatment. Next would be a hose support stand to help things flow and a clear 45 degree elbow to use at the RV end to see how things look coming out (to see when they are clear). Also important would be the Valterra twist-on waste valve to have as a backup in case your RV valves fail. It's another stop to be able to hook up your sewer tube before things come rushing out. We also like having an extra 20 feet of sewer tubing in an extra hose carrier under the RV, which we have probably used 5 times or so in the last 2 years. Sewer weights are convenient as well to avoid any poopsies, though you can use rock and other things most of the time. The flush king back flush elbow valve is nice for end of season cleaning of the tanks as well as periodic intra-trip cleaning, especially when there is food particle buildup in the gray tanks, which have no other flush built in.
WATER:
Some sort of water filter is necessary. This one is just a basic one that we put at the entrance to the RV. In addition, we have a 3 stage water filter under our sink for drinking water and dish washing. A water pressure regulator is also a definite need to keep your lines safe. The exact hose you use isn't critical, but we liked this zero-G hose, either 25ft or 50ft, with a separate hose for black tank flushing (25 ft is fine). A water meter is nice to have an idea of how much you are using. The Y splitter isn't necessary, but also nice to be able to let the pressure out before you disconnect. The blowout adapter is needed if you are winterizing by yourself, as well as a short segment of hose to suck up the antifreeze.
PROPANE:
A RV propane hose is great for grills like a blackstone. Weber grills need to be altered to be able to hook up to the RV because of the 2 regulator issue, so we haven't connected ours to the RV. The propane tank sensors have been great to keep an eye on how much propane we have left. We got the same brand water tank meters and haven't been happy with those, but the propanes are great.
LEVELING:
Nice rubber chocks can't be beat. We never got the plastic ones and are glad we didn't We would have crushed those several times. You need these rubber ones, 2 pairs. The lego block style level blocks have been our go-to for getting our RV level side to side before deploying the autolevel system. If we don't, the RV will lift one side off the group with the tires floating in the air. We prefer these lego types to the Andersen curved levelers. These are just quicker and easier. Levelmate pro is great to know what you need to do without going through trial and error. It helps you get a decent starting point before starting the leveling process and knowing when you can stop and hit autolevel.
TRUCK/TIRES:
The critical piece here is the VIAIR portable air compressor. You can hook it up to the truck battery and fill the RV and truck tires easily. The RV and truck tires run higher than many gas stations have available, and it would be a nuisance to try to get positioned at those pumps anyway. We have used this countless times. A jack that can work with the RV and truck is also critical. Some work gloves are nice for keeping your hands clean when pumping diesel, as well as different gloves for working around the RV and truck outside. The rock tamers gave us great piece of mind when traveling on gravel and dirt roads, especially up to Alaska. We don't know if they are a critical piece because we had them and never got damage, but have seen other people ding up their fifth wheel without them. A hitch stabilizer bracket works well to keep it from jiggling.
INSIDE:
Wifi thermometers are great for detecting issues with the fridge and freezer. They alerted us that our doors popped open on a long drive once and we were able to save everything. They are also nice for monitoring Jordan's bedroom, especially back when she was small and couldn't use a blanket reliably. The water sensors aren't critical, until they are. We haven't had an issue so far, but feel better knowing we have monitors around the water structures. Command hooks and strips are great for many things. The dish drying rack is great since we can hang it in the sink while we travel and let stuff continue to dry.
There we have it. Some keys things to get started. We have many more RV products than this, but these are what we would get started with until you know what else you might want.
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