<font face="Comic Sans MS">I think the gains in stability that you might gain that way would be negated by the additional lift. Body lift would seem to keep it more stable than a suspension lift. I justify that statement as follows.
When you raise only the body yet keep the engine, transmission, transfer case, frame the same height, your center of gravity stays lower. Meaning you have a higher stability than you would otherwise.
When you raise everything (done by suspension lift), your center of gravity goes relatively higher, thus making it potentially more tippy, or less stable.
I don't have any numbers figured out to determine exactly how it would be affected, but there is a definite measurable (even if it's not too horribly large) difference.
Body lift would be about $100 or there abouts for parts cost and suspension, probably expect to spend at least $1000 for parts.
I think that with the body lift and spacers, or even suspension lift and spacers you'd still rub on the upstroke.
The only way to gain clearance with a bodylift is that you can add bigger tires. With a suspension lift, you gain clearance in some areas (frame for example), however usually you keep about the same clearance in the front IFS area since they might use drop bracketry to lower the IFS chunk to save the CV's.
Just my $0.02</font>
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