Is it possible to change a car or trucks ride height? if so how

You can use the SNT to lower it, or maybe in the handling line, there might be a certain part. But I don't know other than those options.

Yes by adjusting the handling line.

CAVCADE 2534 0.36 85 0.0 0.0 -0.21 0.5 4 0.13 1.0 250 0.55 0.65 0.7 33 1.4 1.2 15 0.09 0.48 2.0 1.4 1.4 0.15 -0.12 -0.02 0.5 1.0 1.0 2.5 2.3 0.0 70000 440020 0 0

Here we have the cavalcade's handling line and the number responsible for the ride height is in red. As you can see it's lowered for me. If you wanna increase it, simply remove the - (minus) and add a number pretty much under 0.1 (you can add any numbers you want, but trust me adding 0.05 will raise your car pretty good.