Use your extended warranty to fix/replace the current refrigerator... as that is why you bought the extended warranty. Worse case is you go with a residential refrigerator after the repair and you can sell the current refrigerator. It will buy you time and no need to rush into anything except getting the current refrigerator repaired.
I also doubt traveling above 65mph actually caused the blowout. While your trailer is in for the refrigerator repair, you might want to have your wheel bearings serviced and brakes checked to make sure something didn't cause an "over" heat condition, eventually adding to the reason for the blowout.