Thanks to all of you - my head is swimming - this is way above me but a few comments in answer to some of the questions:
This is intermittent and seemingly random when it goes to showing 30 amps. I just noticed this for the first time very recently. However, it has occurred at more then one location though so on that I think it is likely related to the coach rather than the connection at the park.
As far as I know everything is working when it shows 30 amps. However, I have not gone around and checked things specifically to see that everything is working. That is a good thought though and the next time I see it at 30 I will investigate that further.
I will say that we do not use a lot of high powered things. We do not have appliances such as toasters, coffee makers, etc. The microwave/convection and the hair dryer are the really only high power things we use. Over time we have learned that when I use the hair dryer I must always turn off the electric water heater before using it and definitely not use the microwave/oven while using the hair dryer. That is guaranteed to trip the inverter every time so I've learned to live with that. On this most recent adventure I am using electric for the frig as I am conserving propane since hubby not here to drive MH out for a refill (we are in a remote location). Well I learned first day of that that I need to also turn off the frig when I use the hair dryer as I tripped the inverter while running the hair dryer. I had as always turned off the electric water heater but since we normally use propane for the frig I had not thought about turning off the frig. (I cannot believe this is normal but no one ever seems to be able to identify a problem and this rig has been in multiple times)
Someone mentioned turning on both air conditioners (think we only have one) to see if that sends it back to 50 amps. It actually went back to 50 amps after I turned on the furnace last night and has been on 50 amps since to my knowledge. The jumps to 30 amps on the EMS never seem to make any sense as to when it occurs. I haven't watched it closely until now as I will just notice that it is showing 30 and will wonder why but havent given significant thought. Now I am going to watch more closely and do more checking of things when it occurs.
Someone asked about the tripping with micro/oven. It trips the inverter itself. The inverter recently checked out as "good" when in the shop. The tripping issue has been an ongoing problem. It has tripped several times in the past two or three days. Bet I need to start turning off the frig when I use it. That just now occurred to me.
We have a voltmeter and I have stupidly never learned to use it myself. Hubby does that stuff. Well clearly I need to be learning!
One part of me thinks this may well be the EMS panel like some have mentioned. However, noticing this problem got me to thinking about the tripping issue again and makes me wonder if there is a loose wire or something of that nature that is the cause of both. Maybe not. I don't know. I know that I have said over and over and over that I do not believe we should be able to trip the inverter so easily. Somehow I have not gotten the idea that everyone has to turn off their electric water heater and/or electric frig to operate their mic/oven or hair dryer on 50 amp power! I had completely given up on this issue and have been just living with it. Noticing the 30 amp on the EMS has just made me revisit it wondering if there is a connection.
I will do more investigation when it is showing 30 amp and also see if I can learn to use the voltmeter and find the appropriate places to check as described. I am a bit nervous on that. We will see.
Sorry to be so long. Thanks to all who have contributed.