FishPOET of myjeeprocks.com prepared this list of Big Bear yellow post sites. SCCX and myjeeprocks went on a joint run in the Big Bear area a few years ago. I added a link to the large maps since the images are cut off.
http://sccx.smugmug.com/Other/Maps/i-6wGdR2H/0/O/BigBearSouthYP.jpg8 person max. 14 day stay max. First come first serve. No fee. Adventure pass required. No water. No bathrooms. Currently no campfires allowed.
A 4x4 pulling a pop up trailer would make it without much problem to most of the YP sites in Big Bear. The term RV refers to Motor homes, Travel Trailers and Toy Haulers.
Yellow Post 25
YP25 is located on 2N44Y at N34' 13.363 W116' 56.449.
Lots of shade all day long. A small creek is flowing near camp. Room for 2 tents.
Currently there is not a table or fire ring. There is a hiking trail that cuts right through the campsite. Not recommended for RV's by the USFS. The creek may attract a lot of bugs.
Yellow Post 26 
YP26 is located on 2N52Y at N34' 13.027 W116' 56.694
Wide open area. Down a spur road (less traffic). Can fit 4 tents and vehicles or an RV.
Not much shade.
Yellow Post 27 YP27 is located on 2N10D at N34' 12.896 W116' 57.359
Lots of shade. A small creek is flowing near camp. Down a spur road. Room for a couple of vehicles and tents.
Low profile cars will not make it all the way to camp. No RV's
Yellow Post 28 
YP28 is located on 2N11 at N34' 12.805 W116' 58.783
Large area for parking. Room for 4 tents. Down a spur road.
Some shade. Not RV friendly.
Yellow Post 29 
YP29 is located on 2N11 at N34' 12.950 W116' 58.650
Some shade. Room for 3 vehicles. Down a spur road.
Not much flat space for tents. Not RV friendly.
Yellow Post 30 
YP30 is located on 2N86 at N34' 13.950 W116' 58.805
Lots of shade. Lots of parking. Room for 6 tents. Down a spur road.
Not RV friendly. This is the YP site that was ransacked by a bear a few years ago.
http://sccx.smugmug.com/Other/Maps/i-5PwGmSx/0/L/BigBearNorthwestYP.jpgYellow Post 2 
YP2 is located on 2N80 at N34' 16.616 W116' 58.094
RV friendly. Huge open area. Large enough for 6 tents and vehicles.
Not much shade. Near a busy forest road (2N13)
Yellow Post 3 YP3 is located on 2N01X.
Down a spur road.
Yellow Post 4 
YP4 is located on 2N68 at N34' 16.498 W116' 58.964
Room for 2 vehicles and tents. Some shade.
Not RV friendly
Yellow Post 5 
YP5 is located on 2N84A at N34' 17. 579 W116' 57.652
Room for 6 tents and vehicles. Some shade. Small RVs could make it. Down a spur road.
Yellow Post 6 YP6 is located on 3N97D at N34' 18.566 W117' 00.348
YP6 is a LARGE site. RV firendly. Some shade. Room for 8 or more vehicles.
Close to the green sticker trails. Probably the most used YP site in Big Bear.
Yellow Post 7 
YP7 is located on 3N14G at N34' 19.132 W117' 00.363
RV friendly (although not a lot of flat area). Room for 6 vehicles and tents. Down a short spur road.
Not much shade. Close to the green sticker trails.
http://sccx.smugmug.com/Other/Maps/i-rHdGKTp/0/O/BigBearNorthYP.jpgYellow Post 1 
YP1 is located on 2N04X at N34' 15. 995 W116' 57.105
A view of Big Bear Lake! Lots of shade. Room for a few tents and vehicles. Down a spur road.
Not RV friendly.
Yellow Post 31 
