Am needing to replace my badly sagging front coil springs on my LJ78. Originally came with petrol engine but the previous owner swapped a 1pz diesel in. It also has a bullbar, winch and 2nd battery in the engine bay so is a pretty heavy girl up front. The current coils are ironmans with 2" lift and "c" constant load rating of 50-100kg (dealer says ironman does not offer higher rated springs for my model). Am trying to figure out what coils to swap as the extra weight of accessories and engine probably put me close to or over that rating. Any tips?