Oh, one more thing about the filter.. I see someone puts his filter at the park end of his hose.. Bad idea
you want the filter as close to the RV as possible (Some have it built in) Mine lays in the wet bay out of the sun.
Here is why
Sun heats hose and chemicals get into the water from the hose, Even the best of hoses will do this, and it ends up with a nasty chemical taste.
Simple charcoal filter such as my home brew one or the cheapest one you can buy at the RV isle/store takes that chemical out like you'd not believe. So put it as close to the INLET as you can.. They come with sort strain relief hoses if you buy them that way. (I have in the past).
As others have said: Keep drain valves closed unless dumping.
Hose support: I use one, but in most places it's optional.. SOME places (Clark County, NV, which includes the city of lost wages, The Valley (Los Vegas) is one of those places. I do not know about others.
Fresh water storage: In years past the local water district has been very generous with the chlorine in the water (Tastes like bleach it does) and my filters (2, I re-filter drinking water with a Brita) were not enough to compensate.. This year they seem to have re-adjusted the ratio.. But when they over chlorinate I fill the fresh tank, shut off "City" water (Real city water) and use the water that's stood in the tank for a while (Chlorine dissipates very swiftly unless under pressure) Of course this is not well water.
One of the CGs I stay at in the summer (normally I'd be there now) has well problems and thus I tend to fill up at the other park (Also on well but no problem) and use stored water as much as possible.
IF you plan on short trips.. I recommend you tank up at home, on the water you are USED TO DRINKING, and do not use park water less you have to. Of course this does not apply if you full time or if the camper is parked full time.
A Brita picture for drinking water (or competitor) may be all the filter you need.