Did you get an undercoating package when you bought your truck? I know when we got ours, they added the undercoating after the test drive, and it was applied fresh the day before we picked it up. We didn't smell much on the way home (short drive), but for the next several days, everytime the vehicle got "hot" enough, it would "burn" off the excess undercoating on the drivetrain parts.... smelled liked burning rubber......... pretty bad at times too.
2010 XLT Screw 6.5 box XTR pkg, 5.4, bike hauler
2010 Mazda 3 Sport, Black mica, commuter duties
2008 Kawasaki ZX-6R - race ready (track duties)
2002 Honda Foreman 4X4, 26`ITPs, mud toy