Boy do I need help
Ah, the joys of setting up to hook up no matter what...
First, look at the 1 and only electrical cord coming out of your RV. It will probably have 3 pins (if not, let me know and I will modify my suggestions). 2 of them are power blades, at 90 degree to each other, and the third a round ground pin spaced equadistantly around the circumferance. This is a 30 amp plug. It is unlikely that you need all 30 amps to run your AC, you can probably start it running with 15 to 20 amps and keep it running with 10 or fewer, which is good, because this same plug and cord powers everything in your RV.
This will plug directly into a 30amp socket at many campgrounds. So you could possibly get away with nothing further. But to handle those few exceptions where more is needed, you might consider the following accessories:
1) a power line meter. This allows you to make sure the power is 'good' before you plug into it. There have been cases where people plugged their unit in and suffered damage because the socket was miswired or under powered. If you get one of these guages, you also need something which plugs into the 30 amp socket and allows this standard 115 volt gadget to plug into it.
2) A surge surpressor. 'Surge Guard' is one of the best, providing not only surge and over voltage protection, but protection from mis wired sources. It may also protect from under voltage by disconnecting you when that occurs.
3) An 'autoformer'. This gadget can compensate for undervoltage. A voltage lower than normal can damage your AC, and is somewhat common, particularly in older parks or those which are full on a hot day. These are expensive and bulky though, so you may be able to get by without one. Watch your voltage (option 1) though and don't run the AC when the voltage is under 112 volts or so.
4) 'Dogbone' adapters. I haven't run into a case where they had 50 amps but not 30 amps, but it certainly could happen. And they have an adapter for it, which plugs into a 50 amp socket, and allows you to plug your 30 amp cord into it. Conversely, there are certainly times when all you have available is a standard 15 amp (house) socket, and there is an adapter for that too. Being obsessive for things like this, I made up my own adapter in case I ever ran into a 20 amp only socket. I don't expect to need it though, as most 20 amp sockets will accept a 15 amp plug.
5) Extension Cords. The cord in your trailer will probably be about 30 feet long. This is fine for 95% or more of RV parks, which are designed to accomodate RVs. However, if you are not staying in a space specifically designed for RVs, it may not be enough. A 25' or 30' 30 amp
extension cord may come in handy (Check out WalMart). Definitely 50' or even 100' of 15 amp extension cord comes in very handy when visiting friends or other places where RVs were not expected.
Camping World has a good selection of most if not all of these things.
Now all you have to worry about is hooking up water. And sewer. And cable and possibly even phone