hey everyone. i got a question about truck springs. i own an 04 gmc 2500HD. it has been good to me so far. here is the situation. i have recently upgraded our four wheeler that we take to the track from a 220 to a 500. it is obviously heavier. it also sits in the front of our trailer as that is the only place to put it. since doing that the truck squats more than it has before. it was starting to squat a little bit over the years as well before the quad upgrade. im starting to think it could be time for a spring upgrade. can i put the springs in for a 3500 in my 2500HD? also what are people's thoughts on air bags? what are the advantages and disadvantages? i ask about the air bags as an excavator friend of mine used to buy 3/4 ton trucks all the time and throw the air bags in the rear as he said that they both had the same frame as a 1 ton.