X5 newbie

[Doutreo]

I am in the market for a 00-05 X5. I tow 2 atvs up to the mountains. At least once a month. I am a electrician. So I am always communting to jobsites. I am tired of the beating I take from my current car a Jeep. What type of matience will I have with a X5? What is the life of the 3.0 and 4.4l engines, what is the life of the tranny? Will the X5 be able to handle pulling 2 atvs and a trailer? What is MPG like with the 3.0 and 4.4l manual and auto? I have read a lot of X5 reviews. But, I wanted some real experiences.
I have owned a heavily moded E28 and currently own a E36 328i. So I am not a newbie to bmws.
Thanks