A few comments about things we've bought that make RVing even better:
We bought ours at Camping World for around $30; they're also available from Amazon. You'll wonder how you ever got along without one...
Verizon MiFi Card -- While most RV parks offer (usually free) WiFi, the same can't be said of dry-camping and dog shows... In those situations, Dawn and I have been using a Verizon USB card for WiFi, but that necessitates swapping it back and forth between our computers. Someone told me about the MiFi 2200 "Intelligent Mobile Hotspot" from Verizon, which can serve up to five devices at one time. It's about the same "footprint" as a deck of playing cards, and about 1/3 as tall. It has a rechargeable battery so it can be used with or without a power source. I phoned Verizon and the helpful service clerk worked a great deal for me, including FREE overnight shipping! It's perfect for our needs.
Water Regulator -- often the water pressure at many of the better parks can be higher than our rubber hose & plastic water system can safely handle (I once had a hose blow off the fitting under pressure--believe me, it takes only once...). I found a great source for all sorts of regulators and filters: The RV Water Filter Store http://www.rvwaterfilterstore.com
I bought their Watts brass 263A Regulator, adjustable from 10-65 PSI, with a 2" diameter 0-160 gauge, and 4-4.5 gpm flow. Not expensive and great piece of mind.
Water Filter -- important for removing any debris and harmful gunk, and for improving the taste (and health) of your water. I bought their single canister system with brass hose fittings and a wrench. They offer a large selection of filter systems, and if you can't figure out which is best for you, there's a link at the top of the website where you can "Ask Rick."