This is just a guess but it is based, in part, on what camping world did to me.
In a proper 120/240 volt system (A 50 amp RV is a 120/240 volt system) the two Legs (L-1 and L-2) should be "Balanced" as much as possible. This means, for example. if you have two air conditioners one is on l-1 and the other on l-2. Camping world, when they installed my inverter, put 'em both on the same leg (matters not which leg).
You have no loads active on L-1, all active loads are on L-2.. This is your first issue. There are two ways to fix it.. IF you know how you play musical circuit breakers in your power distribution panel (Move them around so as to balance.. If you do not know how, find someone who does.. I do not recommend playing around in that box unless you know your business.
Now the 2nd issue.. There is a MAJOR voltage difference between L-1 and L-2 with only a small current difference. This suggests a problem, up-stream of the surge guard, If it is a plug in unit and the plug is in good condition then it's the park side, if it's an installed it may be the park or the cords and contacts leading up to the surge guard.
ONE possible "Fix" for both, (temp) would be to swap the legs.. Again, I know how to do this,, but I do not recommend you try unless you know how.
