How many miles does a 2000 Ford Explorer last?

It has 195k miles total with 130k on the motor and transmission.

The engine sounds beautiful. You wouldn't have any idea that it has that many miles on it. And, 4 years or roughly 50k of miles are highway miles as I had an hour commute to college.

Car won't start. Could it be the battery?

When I try to start my car, it makes a noise like its trying to start. But then all the levels on the dashboard (gas, RPMs, etc) jump up & down quickly, and the car doesn't start. It also won't lock, lights don't come on etc. I'm guessing it must be the battery but could it be something else? 2002 ford explorer

How to increase my alarm sensitivity on 01 ford explorer sport XLT?

I have an 01 ford explorer sport XLT and I suspect people are messing with it at night and jumping on the hood for a seat and the alarm isn't going off. I want to know how to increase the sensitivity on it to make the stop doing it because of dents they make. Anyone know where the alarm is and how to turn up the sensitivity?

2004 ford explorer shaking while in park and idling?

I have a 2004 for explorer with about 137000 miles on it and it shakes pretty bad when its in park or when it idles. As soon as i hit the gas the shaking will stop. The check engine light is not on and besides for that there really isn't anything else wrong with it. It shakes pretty violently though. I just need to know if anyone has any idea of what it could be.

Added (1). all of this is good input. But i won't know how to do any of this myself… So are these all easy fixes or cheap? And roughly how much am i looking at spending. Thanks for all your input.

Added (2). and it idles fine. The RPMs are not jumping around or anything… It idles around or just below 1000.