you should have 62mm (confirmation needed) between bump stop and axle, i have disco springs (apparently but i bought my rangie like this) and mine sits at 85mm and i have extended bump stops aswell!
get one of these clicky!
they are really good, and you can run them on diesel/biodiesel/central heating oil/cookin oil theyre cheap to run and pump out some mega heat, and soon dry things out.
ive got the 28kW one in a 60 X 20 X 25 workshop and its makes it toasty in those winter months.