My car wobbles at high speed?

So I have a 2000 Ford Explorer XLT and it has about 147,000 miles on it so by no means is it a new car. The thing is when I go about 55 and above on the highway, it starts to wobble quite a bit. Now I have like 3 different tires in it so not sure if that is the reason lol but I'm not sure if it's something with suspension or not but it really concerns me when I drive to and from school. A lot of people say the cause could be tires but considering how old my car is, I'm starting to think it's the suspension components.

What's the most I can get for my 1996 Ford Explorer?

I have a 1996 Ford Explorer in which I Love, but now is just standing there because it needs some repairs to the Motor and perhaps the Transmission, it still goes back and forth although it still goes back and forth it takes a few seconds to go reverse. The interior is like new considering the years the car has, A.C, radio, Power windows still works. The mileage went around, it restarted when we were coming back from a 16 hours road trip. I live in Miami Fl and people here seem to want junk car pretty much for free, they only want to offer tops 300 dollars, but I think they can do much better than that, what do you think can they?

2004 Ford Explorer V6 RPM Limits?

In Park the RPMs max at 3200. In gear there's no limitations and car runs great. No limit of power.
Diagnostic test states low fuel pressure. Have changed the Fuel Pump and Filter. Other two things recommended is the Fuel Pressure Regulator or Fuel Rail Pressure Sensor
Any suggestions which to change first to save money?

Rebadging a Vehicle?

I have a 94' Eddie Bauer Ford Explorer, and wish to take the old "Explorer" badge off and replace it with an XLT badge as I'm making a Jurassic Park car. (It was an XLT, not Eddie Bauer). I live in the state of Tennessee and plan to be driving it out of state at least once in my lifetime at least. Will it be illegal if I do this?