So, it is important to split your loads and balance them between both phases on the breaker panel in order to get maximum capacity. BUT now we are going to look at amps from a volt, DC standpoint. In other words, picture electricity moving through a wire from right to left. Items you will need Electrical hook-up box Master disconnect switch Circuit breaker Wire Basic electrical tool kit. So Amps Are Amps, Right? You'll see what I mean later.
When you do this you'll be limited to 30 amps of power though.
Some RVs may have volt stackable clothes driers or an electric heating element of some sort but it's rare. Or get too much capacity and you've simply spent too much money.