S22 to S2 to SR79 is no problem to the west from Borrego Springs - but there are the curves between Borrego Springs and Ranchita. The issues come once you get west of SR79.
Since you climb into the coastal range westbound, there are curving mountain descents:
~On SR76, east of Pauma - but beyond that is good all the way to Oceanside
~On SR78, west of Ramona - but beyond that is good all the way past the SD Zoo's Safari Park - Escondido - and on to Carlsbad.
The easiest route in a RV is west S22 - right on to S2 - and left to southbound SR79...all the way to a right on west SR78 in Santa Ysabel...then continue forward on SR67 in Ramona (do not turn right to SR78 in Ramona)...
Then for Del Mar:
...South on SR67 (a curvy country road) - right on S4 into Poway (long descent into town) then the dogleg up to west SR56/Ted Williams Parkway.
Or for San Diego:
...South SR76 (curvy country road)...all the way to Lakeside and Santee (L-O-N-G descent into Lakeside), then west SR52 to I-15 or forward to I-5.
Be warned, as soon as you hit the area within about 5 miles east of I-15 all the way to the coast (Pala on the North - Poway in the center - Lakeside on the south), you may experience commuter traffic from 7-9:30AM and 3-6:30PM. Commuters are mostly going east to west in the morning and west to east in the afternoon commute...that means stop-and-go traffic and impatient drivers that WILL cut off an RV. I-5 has a VERY HEAVY commute (both directions) from Camp Pendleton (north) to Chula Vista (south)...surely worth avoiding those time periods if you can.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV