Got my first 4Runner ( first toyota 4x4 as a matter of fact) it is an 06 SR5 4x4 4.0 V6. I am loving the truck so far. I have had many different 4x4's over the years starting with a Jeep J4000. My question is are there problems I should be on the look out for? Or any thing that requires more than just general maintenance inherent to all 4x4's.