It looks like this could be the problem as the oil level is above the full mark and appears to be climbing on the dipstick. It is now about 1/4 inch below the part number stamped in the dipstick.

This started just after I rescued my neighbor and pulled his travel trailer back to Phoenix.

Is there a diagnostic check to determine if it is an injector leaking into the crankcase?

I will let you know what I find out.