This is not going to end well, we fear

The RV was towed to Freightliner in Memphis ($1260.00) and we checked into the Courtyard by Marriott in Germantown, TN.  I made a 2 night reservation just in case. Dog friendly.  Near a grocery store and many shops and things. The preliminary findings of the mechanic is that he is suspicious there is a headgasket issue in addition to the serpentine belt.  More to follow.