If you get a torch and want a lot of heat, Propane won't cut it (no pun intended).
Get a MAPP torch - yellow cylinder, different jet size, LOTS more heat, about the same cost.
I always use an 18" long 1/2" breaker bar with a 6 foot piece of pipe on it, along with a resistance bar attached to the hub bolts. Heat the nuts up and hang on the end of the pipe and they should slowly loosen (and I only weigh 160 lbs!)