Thanks a lot for all the info! Will definitely check Ramona area more some time, will hit you up next time I plan to ride in the area! Was also thinking to get some small trailer (bike is probably too heavy for the hitch rack), but my current car is technically not suited for towing, need to wait for another year for factory warranty to expire to start messing with that. Rally is actually not that bad and pretty fun on 50-60 mph roads, though installing MT21 tires and stiffer suspension made it a bit less comfortable on longer stretches.
Also, in case somebody does not know, you can still enter Otay Trail at Pio Pico campground gate. You just need to ask for the gate code at the booth, they never refuse. Takes just a few extra minutes to deal with that.