A 30A RV cord is different than anything they sell at Lowes, bushpilot has the right picture above. 50' is about right for campgrounds, etc., as the outlet is not necessarily sitting in just the right spot to be next to where the cord drops out of your truck. The placement is pretty random from site to site, but almost all are on the left (drivers) side and towards the rear of the unit. My cord drops out about 30' from the rear of the trailer, and by the time you go down to the ground, across, and up the pole, the 50' cord has always served. I carry lots more because we are in unusual situations at events. The 20A cords are just your standard 110 3 prong, just heavier wire than your run of the mill 15A cord. You really need the 20A cord vs. 15A for longer runs if you are pulling any kind of load. But that one standard 30A RV cord will suit in most situations, and always carry the adapter to get you down to a standard 110 wall outlet just in case.
You should never have a need for a 4 prong connection (220) on the road, just take that sucker back to Lowes and put the money towards standard stuff. Bushpilot gave good links for those cords online. Your local RV store will have them on the shelf, but they are generally crazy expensive there.
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