Peon, in my experience that sulphur smell come from the air filter being less than clean. I have seen 2 in 1 of my accounts that experienced that exact problem. Cleaned the filter and the smell disappeared.
As far as the IC Toyota goes, it's a solid truck- period. I've worked for Alis Chalmers, Clark, and Crown/Doosan. The latter for 20 years now. I have a customer I tell to purchase Toyotas ( from a competitor and IC only) because I know how they tear up trucks. All electrics are Crown, and the IC's are Toyota. They're a 24/5 operation and demand tough trucks. Some IC's have 18,000hrs with no problems. They retired a 5 series with 26,000 hrs. I think Toyota slacked a little on the quality of the accessories, and hardware on the 8 series, however as previously pointed out, the powertrain is proven and solid. By the way, they also have some Crowns with 16,000 + hrs and no problems. ( sorry, had to plug the Crown as well )