Considering Trade from Gasser to Diesel

I have a 2005 Ram diesel and a 2003 VW Jetta gasser. Both are at 120,000 miles and the Ram has had one repair with the fan clutch. The Jetta has cost far more in repairs, fortunately some under warranty, many not for the same mileage. We lost a coil on the Jetta on a trip and it took out around $1200 worth of stuff with labor. The thermostat is about $300 with labor, the timing belt at VW with labor is near $1000. So, repairs are at the labor rate of the dealership regardless if gas or diesel. Parts are a little more for the diesel but labor is about the same. If you keep a vehicle long enough the entry fee difference between a gasser truck and a diesel becomes a moot point and in most cases the diesel will bring more on resale. The biggest issue is whether what is being towed or hauled is more than around 10,000 pounds and after about 12,000 pounds you are solidly in diesel terrority. Gassers just don't have it for those kind of weights especially in the mountains where the turbo diesel provides essentially sea level power up to around 12,000 feet and the gasser loses 2.5 percent of it's sea level power for each 1000 feet elevation. By the time you have crested the summit of a 7000 foot mountain pass the gasser has lost more than 15 percent of it's power; the diesel none. That is huge for those towing in the mountains. The power difference in towing between your gasser 6.0 and any of the turbo diesels is not in the same hemisphere. You will wonder why you waited so long to get one.