"About the power, it is not more than enough especially for those sand hills"
People who know me, know this is true. So I'm not just making this up
Earlier my profession was that of a Desert Safari guide, which I did for almost a decade, and used the same car you are thinking off, first was a 2000 GXR LC100 series with a manual transmission and later a 2003 LC 2003 with an Auto,So I know these cars pretty well and big part of my day was spent driving them and on off days in the shop with them, fully loaded with 6 pax, full two tanks of fuel and very basic suspension modification ( heavy duty coil in the rear and torqued stock torsion bars up front ) it had still enough power to go everywhere and I drove in almost every desert patch in this country from Liwa to Khatim.
Also mind you these were not bought brand new off the showroom floor, but bought second on the cheap with over 100k kms on the clock, never opened stock engine with not even a CAI or modded exhaust.
So to answer your question, yes it does have enough power.