Ray
You may want to go to googleearth.com and have a look. I'm crossing upper NV on hwy 50, one night at Ely,NV the next night at Moab UT and the next day into SF NM. There will be hills. I would do what I could to get the jake fixed. Adj your brakes before leaving home. You'll be fine, take it easy in the hills and gear down.
Harry