Since this is an electrical thread, it is going to fill with all sorts of bad information. I am reasonably sure that two years ago when the park first told them about their electrical connections they told the OP there was a 30 amp plug and a 15 amp plug. Someone without any knowledge of electrical systems then decided you add those together and get yourself a 45 amp service, which, as has been pointed out doesn't really exist in the real world.
As for the damage to the rig, it could be most anything. With really old RV pedestals, they generally were not wired with both legs of a 240 volt circuit entering the box. So it would most likely be improbable, if not impossible for the handyman to have wired it for 240 volts. If it was improperly wired, it will be real easy for an electrician to find it out with a simple multimeter.
What I kind of think happened was the OP got an older RV and this was the first time he had plugged it in. Most likely the wires inside the rig had either worked their way loose, the connections corroded, or vermin had chewed some wires. This would cause the burning of the wires, as opposed to appliances being damaged as would happen if the pedestal's 30 amp plug was accidentally wired to 240 volts.