I also think Satellite internet access is a prime need.
After that: online banking, ATM access, cell phones
This forum provides plenty of social interaction. I lurked for 3 years as I planned what to buy. After I got my rig, I started to contribute to the forum traffic and began to meet all the wonderful people that I had known onscreen for years. Now I make arrangements to meet up with others of our group as I travel about the country. Loneliness is never a problem.
Features I like best in my coach: electric heated floor in kitchen and bath. It is all the heat I need down to 45 F. Independent front suspension gives me great maneuverability. Basement slide out trays ease access to all my stored stuff. GPS navigation device almost makes getting lost impossible. Tire air pressure sensors have saved my bacon 3 times...2 with the tow car and once with the RV. Before the sensors became available, I did $2,000.00 damage to the L front axle and brake system of my Jeep because I could not detect it (37,000 lb RV vs 4400 lb Jeep).
Big rigs must have Jake or exhaust brake supplement.
Coachnet or equivalent. Dependable breakdown aid. They will send the right size tower for your rig. They can locate and help you make appointments for service on the road.
Get the rig serviced/repaired at the factory repair center for best quality.
Join FMCA/Escapees and go to their rallies for the superb educational seminars.