1. I have summit 3" springs on my truck and they ride fine but there actually ground force brand
2.sounds pretty cheap
3.yes I have a beltec flip kit and drop shackles
4. it depends on the bs on your wheels
I have djm 3" spindles and ground force coils with beltec flip kit, shackles, and c-notch with 215/70-15s on front and rear 275/6-15s