the principal climbing difficulties along your route are:
1. a short mile or so stretch on the 79 a few miles into the ride. if memory serves, it's about a mile at 5-6% climbing out of the little valley onto the plateau.

2. a slow rise of a mile or two on the 79 before warner springs.

3. san felipe road heading towards the "y" intersection of the borrego springs turnoff or continuing to teofilio (sp?) summit. the steepest part is just before the turnoff
or, if continuing, just before teofilio summit. either heading to ranchita and to borrego springs or to teofilio summit, it's a steady 3-5% climb of a few miles.
biggest difficulty in the area is that ranchita is the windiest place in sd county and you're usually heading into a headwind the direction you're traveling. happy trails!