The cummins is a very good motor. 12V or 24V. Its the trans and the crap its wrapped in. The frame looked good in the one pick. I'd drive it and see how the front end feels. It always seems like the front end stuff goes bad all the time
front track bar, upper and lower balljoints and Ujoints are something to look for but id say its a pretty good deal if you can crawl around under it a verify she's ok (trusted friend inside to shift from D to rev/lockto lock the wheel, etc)
a converter, good cooler and good internals... and regular maint. and the trans will handle plenty of abuse - billet parts are only needed for 1000hp 4WD launches...