Replacing, and upgrading most suspension parts

[glaze148]

Hi All,
I have a 92 Silver. I may be shipping it to the NE, and will have a daily 1/4 mi. trip back and forth up a VERY bumpy dirt road to access my rental house.
I'm a new owner, and have zero mechanical abilities. I paid $5000 for it, and it runs nicely, and is very clean. I'm planning on a new timing belt, and all that goes with that job. I have 82,500 mi on it. One mechanic suggests waiting till 90,000, get the service and do the belt then,so it will be on schedule. By all indications, it should drive ok till then.
So, back to the suspension question. I'm willing to invest a total of about $4000, { with belt, and service}to get it to a strong level mechanically.
At this point, it already makes a number of rumbling and low volume popping sounds. I'm fussy about noises.One experienced mechanic said to just leave it alone until, and if it goes really bad. He said even if I put money into it, it may not result in real improvements.
Any thoughts?
Thanks, Steve