Mebert - Our RV has 110v and propane AND 12v appliances.  All our lights inside the coach, the 3 extractor ceiling fans, the radio, dash fans, and rear camera on the dashboard all run on 12v.  We have an Inverter onboard that  converts 110 to 12v and charges the coach batteries.  (We have 4 huge batteries).<br />
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Different parks offer different power supply; some 50amp, some 30 amp, some of the old one&#39;s only have 15 or 20 amp.  the big newer rigs are wired for 50 amp ... like ours. So our preference is 50 amp which means we can run every appliance in our coach similtaneously and not kick out the breaker.  Sometimes parks (especially State Parks) only have 30 amp.  W have a &quot;pigtail&quot; plug that goes from their 30 amp supply to our 50 amp coach...but that means ALL we have is 30 amp power.  So we cannot run the washer/dryer and the microwave at the same time, for example. We can only draw 30 amps at a time.  This is a list of how our appliances are powered.<br />
Range/Stove - Propane<br />
Washer/Dryer - Electric<br />
Microwave - Electric<br />
Refrigerator - Electric, Propane or 12v<br />
TV - Electric<br />
Water Heater - Electric, Propane and it get heated up whilst the engine is running through a hot water coil that goes around the heater (complex).<br />
Air Conditioner - Electric<br />
Furnace is both Electric and Propane.<br />
Then we have a huge generator which runs off the gas from our coach&#39;s gas tank.<br />
All plugs - Electric, so we can run all ELectronic devices.<br />
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At each site you park next to your hookups.  Which generally are your power source,  a water supply, a cable supply (we just plug it into our cable receptacle), a sewer and sometimes a phone supply for a landline phone.<br />
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The coach has 2 basement compartments that have all the &quot;controls&quot; for these hookups.  We hookup our sewer hose to our &quot;black tank&quot; and the other end goes into a donut fitting in the ground... when it comes time to dump the sewer you just pull a lever and down it all goes from your holding tank into the sewer.  The &quot;grey tank&quot; which is waste water get&#39;s emptied the same way - very easy&#33;<br />
Our shower is great.... plenty of room to move around and works fantastic... I never use a bathhouse unless we&#39;re at a State Park with no sewer hookup then I use the bathhouse so that we can go longer without having to dump our grey water tank.  All parks that don&#39;t have sewer on your site have a seperate dump station that you can use on your way out of the park.<br />
We also have a 70 gallon water holding tank, which we keep half full in case we want to use the potty on the road, wash hands etc - we also have a 12v pump onboard... just flip a switch and it pumps water when you need it.  So that&#39;s helpful when you dry camp.  (Dry camp means no hookups at all).  Like our trip to Alaska we&#39;ll keep our water tank 3/4th&#39;s full, because we&#39;ll do some parking alongside rivers and lakes with no hookups, and we&#39;ll run our generator... so we&#39;re completely self contained.  Oh yes we also have a water purification system.  But we always fill our water tank when we are at a park that is on &quot;city water&quot;.<br />
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When you pay for your site - let&#39;s say &#036;20 a day, most of the time that includes all the power, water and sewer.  Every once in a while we&#39;ve run into a park that reads your meter when you leave and add that to your stay... these places are generally cheaper i.e. &#036;16 a night plus electric of about &#036;2.50 which still comes out to the same, most of the time.  Some very plush resorts charge upward of &#036;40 per night&#33;<br />
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Hopefully I&#39;ve answered most of your questions.<br />
The weather is gorgeous here today - so we&#39;re on our way out.<br />
Stay safe Mary Lou, Mebert and all others up in the nasty weather&#33;