Sorry Timothy, but Bob Thompson, master electrician did not fully understand your application. You do have 100 amps total, available for use, at 120 volts, in your motor home.
The way to look at it is thru power analysis. For the techies in our group, I'm ignoring some details, like power factor, etc -go easy on me.
Bob Thompson is correct about the 50 amps at 240 volts. The power of that service is (240 volts) times (50 amps) = 12,000 watts. You have 12,000 watts available to use in any form you wish.
If you're only using it at 120 volt level, then you calculate
(12,000 watts) divided by (120volts) = 100 amps.
OR, suppose you have a really cheap welder. If you set it on a 12 volt AC tap, you will have
(12,000 watts) divided by (12 volts-ac) = 1000 amps-ac !
Please, think of everything in terms of POWER = volts x current which is the same as:
amps = POWER / volts
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