the 05's had an inherent issue with overheating when towing. I have a friend that has been fighting this for years. Another friend who owns a diesel performance shop said it's very common.
Glen
04 Tail gator XT 34' 5th wheel garage model
200w solar 2 GC2's 800w inv
Truma tankless WH
99 F350 CC DRW 7.3 ais intake, adrenaline hpop, JW valve body,
cooling mist water inj, DP tunes, 4" exh sys
trucool trans cooler added
2011 RZR 900xp