My TT is 50 Amp and is wired for a 2nd A/C unit that isn't installed.
Basically, 50 amp service is really two separate 50 amp circuits. My breaker box is split in half and each 50 amp circuit serves half the box. Virtually everything in the trailer is on one 50 amp circuit except the 2nd A/C wiring and my converter.
So bottom line is that 50 amp service does give me an extra 20 amps on the side where everything is, but the 2nd 50 amp circuit does virtually nothing (except of course run the converter).
Practically speaking, I can pretty much run everything I need to without issues, but if I had the electric hot water heater on and my wife got out of the shower and started drying her hair at the same time that I decided to turn on the microwave on a warm day with the A/C going, I'd probably trip a breaker.
I have thought about moving the microwave and the hot water heater to the other half of the box, but haven't taken the time to look to see if there is enough wire to reach to the other side. And since we haven't had any issues so far it isn't a high priority on my task list.