James-I've run that trail several times recently, and the 4Runner is not the best choice for it. You might get through the trail with care and a lot of extra time. Breakage on this trail is a major issue. There are no spares within days of where you are. Unfortunate, but true.
Run the Rubicon first. The degree of difficulty is about the same, but Dusy is much more remote, and much longer. A major breakage is a real issue on this trail, so go prepared to fix anything. We had a guy break a sector shaft in his steering box this year. If you think about it, that isn't really a fixable problem. Broken axles are also common on this trail.
Just to relate one other story-we ran into a group of 3 guys in early Broncos 3 years ago. One of them had broken his transfer case on Thompson Hill. They had been there 4 days trying to fix it, and were out of gas, food, water, and beer. They had a plan to drive one rig down to a junk yard in Fresno, get a t-case, then return, fix the truck and drive out. We gave then some water and some food. I assume they got out since we didn't see any skeletons this year!
If you took an IFS truck through there, it might be the first one in the modern era. Good luck, but don't think it will be easy.