Whatever you do, do NOT buy a second Dodge Cummins, because... you'll never wear two of them out. I've got two 96 Dodge Cummins, 1 with the automatic and the second with the 5 speed manual. The automatic I've had since new with 205K miles on it. In 2003 I found my second Cummins which was also a 96 with very low miles, now showing 105K on the odometer. At my age (62) I'll never wear them out now. Both are 4wd.
I agree, you should sell the one with 105k on the odometer to me. No sense in insuring two trucks
