Rode one from Ft Lewis to Ft Bliss, Border Star 85. My favorite of all time is the C141, never felt safer anywhere in the air. Slow, noisy, and cold I’ll take it with jump seats and a poncho liner over any first class commercial flight.
After going to the Sinai on the ill fated Arrow Air DC8 Stretch that crashed in Gander the C141 home was a Godsend.
Oh man, I loved the Starlifters! Smooth as any airliner. By contrast the C-5's (cool as they were) were bumpy and even more noisy. You always needed ear-muffs during the ride.