Just had an old Western plow mounted to my old 90' f150 4X4 W/straight 6 engine. Getting tired of plowing with my ATV. My problem is that obviously the front end is now very heavy and sags a lot! They had to remove the front sway bar to install the plow mount too. My question is do I look for heavier coil springs or will airbags work ok. I can get airbags from JC Whittney for $85.