Just bought a new to me 2004 Yukon Denali XL. It’s a secondary vehicle that I have to tow my 5000lbs boat to the lake and back. Air ride suspension no longer working and I want to switch to coils and standard shocks. I’ve seen conversion kits priced anywhere from $500 to $600. Are they necessary or can I get away with ordering coils and shocks individually? I am not concerned with eliminating the error message on my dashboard, just want to get a functioning traditional suspension.