AN ACR PLT FOUND HIMSELF IN THE MUD AT AN AFB.

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ACFT LANDED RWY 36. TWR REQUESTED THAT TXWY B BE USED FOR RWY EXIT; WHICH REQUIRES A R TURN OF APPROX 125 DEGS. ACFT WAS AT TAXI SPD PRIOR TO REACHING TXWY B AND BLUE TXWY LIGHTS ON L AND R SIDE OF TXWY WERE IN SIGHT. ACFT WAS PAST LIGHTS ON SW SIDE OF TXWY B PRIOR TO MAKING A R- HAND TURN. LNDG; TAXI AND TURNOFF LIGHTS WERE ALL ON WHEN EXIT WAS MADE ONTO TXWY B. ACFT APPEARED TO BE PROPERLY ALIGNED FOR TAXI. SHORTLY AFTER ENTERING TXWY; ACFT LEANED TO THE R AND STOPPED. TWR WAS CALLED TO GET SOMEONE TO INSPECT THE R MAIN LNDG GEAR AND WE WERE ADVISED THAT R MAIN LNDG GEAR WAS OFF TXWY. LATER THAT MORNING; I INSPECTED THE AREA WHERE R MAIN LNDG GEAR WENT OFF TXWY. THE FIRST BLUE TXWY LIGHT LEADING FROM RWY 36 ONTO TXWY B WAS APPROX 14 FT FROM THE SW EDGE OF THE TXWY. THE SECOND LIGHT WAS APPROX 12 FT FROM EDGE OF TXWY AND ALL SUBSEQUENT LIGHTS WERE APPROX 8 FT FROM TXWY EDGE. TXWY LIGHTS ON NE SIDE OF TXWY B WERE ALL DISPLACED APPROX 8 FT FROM TXWY EDGE. AT NIGHT; BECAUSE OF TXWY LIGHT POS; TXWY B APPEARED TO BE 16 FT WIDER THAN ITS ACTUAL WIDTH. THIS WAS MORE PRONOUNCED ON SW SIDE ADJACENT TO THE RWY. APCH CHARTS; RWY AND TXWY CHARTS WERE STUDIED PRIOR TO DEP FROM MIA AND AGAIN PRIOR TO APCH AT MPHO. NO MENTION WAS MADE CONCERNING TXWY LIGHT POS RELATIVE TO TXWY EDGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR FLIES THE L- 1011 FOR A SUPPLEMENTAL ACR. THERE WAS NO DAMAGE TO THE ACFT OTHER THAN 3 TIRES. THE INBOARD TIRES HAD SIDEWALL DAMAGE FROM THE EDGE OF THE TXWY SURFACE AND AN OUTBOARD TIRE WAS DAMAGED BY A TOW BAR. ALL 4 R BRAKES WERE CHANGED AS A PRECAUTIONARY MEASURE. THE RPTR WAS ASKED TO TURN ON TXWY B AS THERE WERE 2 LARGE USAF ACFT PARKED ON TXWY A. THE RPTR IS NOT SURE WHETHER THE ATCT LCL CTLR MEANT FOR HIM TO TURN L OR R ON TXWY B. A L TURN WOULD NOT HAVE BEEN A REVERSE HIGH SPD; AND THERE IS A RAMP FOR A 180 DEG TURN. THE RPTR TURNED AS HE USUALLY DOES IN AN L-1011; AND THE NOSEWHEEL WAS NEAR THE TXWY CTRLINE WHEN HE FOUND HIS R MAIN LNDG GEAR IN THE MUD. THE RPTR BELIEVES THAT A WARNING FROM THE ATCT OR A NOTE ON THE COMMERCIAL ARPT CHART WOULD HELP PREVENT THIS PROB FROM RECURRING. THE RPTR IS NOW AWARE OF THE FAA SAFETY HOTLINE.