I had the same problem with my 2000 and it was frustrating to say the least. I made a wind guard which didn't help that much. I had a wireless thermo receiver inside the car and when the temp in the refrig started rising I would stop and relight. I solved the problem by observing the pilot light
at night and while doing this I had my wife turn the thermostat to high and noticed no change in the pilot burn. Replacing the refrig thermostat the problem was solved and when traveling I would turn it to max cool allowing a high burn and never another problem.