The 2007 have the upgraded 5th gear so it should be OK to tow but personally I would use tip-tronic 4th especially if you are running slightly bigger tires. This will stop the hunting between gears.
Also consider the "cruise in manual mode" mod which allows you to use your cruise control
2006 Patrol 4.8 GRX Tiptronic Y61/GU(4)
ARB Bullbar, TJM 2" Suspension, Snorkel, 285/70/17 BFG KO2's, 40L Engel, Nuvi 1410, TPMS, SatNav
Stop Rhino Poaching Supporter!