Thankyou to those stating options for 500nm RAA aircraft to carry 265ish kg.
As for the comment concerning 25kg of "bags" being excessive and a large GA would be more suited indicates some people either dont weigh it, or dont travel distance.
What would you not take for two people for two weeks for around 5000nm in July in Vic,NSW,Qld,NT,WA and SA?. Our 25kg was: two headsets,406EPIRB,sat phone,4L water,2 space blankets,small box tools,ERSA,AOPA airfield directory,PCA,19WAC,4VTC,2VNC,4ErcL,navigation implements,hand held GPS,Pilots log,aircraft manuals,Mr Funnel,camera2,binos one, plus clothing (each);jocks&sox4,shirts3,pants one,long sleaved top one,jacket one and toilet items. With a couple of bags this was 23kg!
Even had to tell my wife I could not get her an Argyle diamond at Argyle as we would be overloaded!