I have a Fisher push frame on my '85 K10 Suburban that came off a truck with a 4" lift...they modified the push frame by dropping the push bar the 4" to compensate..
With no lift on the Suburban and 225/75-15 tires,the push frame looks very close to the ground,I suspect there will be places it'll bottom out on, if I drove it with those dinky tires on it..I planned to get at least 31/10.50-15's for it..
Whoever built the home brewed push frame on my 4x4 pickup also made it hang pretty low,but I cant recall ever having it drag or bottom out climbing up steep driveways or anywhere around town..yet!..