You know that hill you go up now at 2000 RPM in your diesel? It will be at 5500 RPM in the gasser. If you like to hear a screaming motor, get the gasser. If you like the easy rolling diesel, pay for the repairs and drive it for another 10 years.
A friend of mine just pulled his 35 foot trailer with a diesel for the first time last week. His first comment when he arrived at the campground was, it didn't even work coming up the hill. This is a man that has always modded his exhaust to get the loud V-8 sound. He said "No more screaming motor and stopping for fuel every 150 miles."