Thngs that don't work on a U.S. spec RV when taken to Europe:
Television - No television reception, either over the air or via satellite. The standards are different.
Radio - Tuning is different, 9 khz spacing for AM, 10 mhz spacing for FM, so you will see frequencies like AM 873 and FM 100.2. If you have an analog radio tuner, you will be fine, a tuner with a digital tuner MAY work if the radio can be switched between European and U.S. standards. Not all digital tuners will work.
Electricity - U.S. standard is 120 volts, 60 hertz. European standard is usually 220 volts, 50 hertz. Analog clocks will lose 10 minutes an hour, IF you step the voltage down with a step down transformer. Your microwave will not be happy.
LP gas - European filling nozzles are different. SOME LP gas retailers, primarily those close to the dwindling U.S. military presence, have adaptors.
Fuel - be prepared for $8 to $10 a gallon fuel costs.
Size of rig - A big class A will not fit on many urban streets in Europe.
Taxes - Be prepared to post a bond with the customs authorities. This bond can equal the value of the rig or more.
Shipping - several thousand dollars each way, and several weeks to transit the Atlantic both ways.
Not that I mean to disuade you, many people do bring RVs from the U.S. to Europe. You would have more success with a towable in my humble opinion, having lived in Europe and rented European "C" class equivalents for my vacations for several years.
