I have a 50 amp rig. If it is not hot out 30 amp is adequate. However I would much rather have 50 amp service if I can help it. When my 50 amp rig is on 30 amp service . I have to use energy management techniques. Water heater on gas, only one big draw item at a time. for me it's just a hassle that I try to avoid.
My last rig was 30 amp and it was no big deal. But using my 50amp rig on 30 amps is very doable, but in the end I have to watch what I'm using which detracts from my enjoyment.