Thank you, Stircrazy! After posting yesterday, I spent some time searching the subject and found both of the breakers online. The single pole 30A breaker had to be replaced with an Eaton CL type, but it's exactly the same. The other, a double pole 20A breaker, which is in a single pole size casing, I actually found a new T&B breaker. Hopefully, this is the problem. I don't see what else it could be, short of a bad socket on the 5th wheel, since that's all there is between the 100' cord and the breaker box. I'll report back after I get back down to the property and install them. I also need to hook up the generator and see what happens with that.
What is so strange about this is that just a month or so ago, after I finished firing up the system after having to get two new breakers for the PV input into the charge controllers, I hooked it up and everything worked fine. I'll report back after I try the breakers when they arrive. Thanks again!
