A BE40 CREW TAXIED ON A WEIGHT RESTRICTED RWY.

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UPON LNDG AT LUNKEN ARPT (KLUK); WE WERE GIVEN TAXI INSTRUCTIONS TO BACK TAXI ON RWY 25 THEN RWY 3L TO TXWY CHARLIE; THEN TO THE FBO. DURING TAXI THE TWR QUERIED; 'ARE YOU BELOW 12500 LBS?' WE RESPONDED; 'YES.' (WE WERE ON A VERY SHORT REPOSITION FLT FROM KIND TO KLUK.) WE FLY INTO KLUK REGULARLY AND HAD RECEIVED NOTAMS PRIOR TO THIS FLT AND HAD REVIEWED THE COMMERCIAL ARPT DIAGRAM AND WE STILL HAD NOT SEEN ANY WT RESTRICTION. WHEN WE REPLIED WE BELIEVED WE WERE STILL BELOW 12500 LBS. (IT WAS CLOSE). WE CALLED THE TWR AFTER SHUTDOWN TO MAKE SURE THERE WAS NO WT RESTRICTION FOR TKOF. (IF SO; WE WOULD RE-FUEL AT ANOTHER LOCATION.) THE TWR TOLD US THE WT RESTRICTION APPLIED ONLY TO THE BACK TAXI ON 3L; WHICH WAS THE SHORT RWY. WE THANKED THEM FOR THE INFO AND TOLD THEN WE HAD NO INFO ON IT ANYWHERE INCLUDING NOTAMS WE ASKED WHERE IT WAS PUBLISHED. THE TWR WASN'T QUITE SURE; BUT MENTIONED THE NAME OF SOME FEDERAL PUBLICATION WE HADN'T HEARD OF AND DIDN'T KNOW WHERE TO FIND (NOR DID HE). THE TWR WAS SURPRISED IT WASN'T ON THE COMMERCIAL ARPT DIAGRAM OR IN THE NOTAMS. WE WERE NOT QUERIED BEYOND THE FIRST QUESTION AND I HAVE NO REASON TO BELIEVE THERE WAS ANY PROB. THIS RPT IS BEING MADE IN AN EFFORT TO BE CAUTIOUS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE WT RESTRICTION CAME AS A SURPRISE; BECAUSE IT WAS NOT MENTIONED IN THE NOTAMS NOR WAS IT PUBLISHED ON THE COMMERCIAL CHARTS. HER COMPANY PROVIDES; THROUGH THE 'FLT OPS MANUAL;' INFO ON 'SPECIAL USE ARPTS;' BUT THE CREWS MUST RELY ON NOTAMS AND COMMERCIAL CHARTS FOR SITUATIONS LIKE THIS.