"I was out 4x4ing and left my truck in 4wd when I was on the pavement between trails. I noticed a strange smell coming from my truck. What was this smell and what caused it?"
This smell was coming from your locking hubs on the front wheels as they were starting to burn up. The Daihatsu Feroza / Daihatsu Rocky / Daihatsu Sportrak's 4WD system is made for low traction surfaces and should not be used on high traction surfaces.