First - what is a BF Goodrich Advance TA ? Is it an LT tire? What size is it? Load rating?
Second - what's your idea of "ok" where "air pressure" is concerned? Is it the same as mine? There are three Suzuki Vitaras in my drive way, three different generations, they all have different sized tires and different recommended tire pressures.
Moving on - there's a ton of stuff under there - ball joints, control arms, bushing, trailing arms - that if they are the factory originals are probably worn out.