Some times i see bunny hop in cars,more so with lowering blocks*,poor shocks**,and also if spring clamps on front part of leafs have opened up***. Bars that bolt to the "U" bolts and run up front near the spring eye do a fairly good job when adjusted right.
Some tricks we used that worked;added lots of hose clamps to front leaf spring for a day at the strip, also adjusted tire psi,a little less in one side then the other can make it come off straiter if ya get it rite.