Timberwolf + hardpack = bad news. Knobs can have a tendency to fold. Great tire for East Coast riding or anyplace that the terrain is soft where the knobs can sink in for grip.
The Pan FR is an OK tire at best. I say get it if your not so concerned with tire quality and performance, but more with size and price. It after all a huge tire and fairly cheap when compared to better quality tires that offer far more exceptional performance.
If you want an awesome tire for the conditions you describe then I suggest you take a look at the Kenda Blue Groove Stick-E. This is an exceptional hardpack, rocky, loose terrain tire. I've been using them for @ 2 yrs now everywhere in California and also at Bootleg Canyon, NV. Low profile, wide knobs that stick to the terrain like glue and roll extremely fast. Give it a look here Kenda Tires
or click on pic for more details.