Most S&B's have 200amp service. Why not 250 or 300 or lets go wild 500amp service. Same logic applies. The next owner may have a need for heavy usage. Or why don't you buy a MTD for your 5er because that is what the next person needs wants. I can put in any size circuit I want/need and I could care less what the next user/owner needs/wants. I need to replace my furnace/air conditioner and I will do it without a worry as to the next owner. I almost bet nobody has tripped a 5oamp pedestal c/b or the one in their trailer. I may even go out a limb and say most have not even pulled 35amps per leg on their 50 amp rigs. JMHO.