Contact Marco aka
Yeti (PM or email) on this forum and get his Hot Tune Stage IV; it has plenty enough power to pull those 265's.
265's are only 1 inch taller than 245's!
I have 245x75's with Yeti's Stage IV Hot Tune and have pulled 4-5k loads on a trailer in hilly terrain and had plenty of power.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve