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Hi Onyx,
The rear coils PN 2910 are the lightest ARB/OME make with a free height of 370mm to 390 mm and a progressive spring rate of 150/260 lbs/in and these are giving you an empty ride height of 595mm EBH but when you are loaded up and have the camper hooked on, ride is reduced to 550mm/555mm EBH.
Fitting Peddars 5899 will help with controlling deep compression but these only come into play at EBH 535mm or less, and will not assist you earlier in your suspension compression or effect your static ride height. You would need a 30mm spacer under the 5899'S for them to give you the desired ride height when loaded but by doing this you will decrease the rear axle articulation off road.
Next spring from ARB/OME is PN 2938, 390mm to 400mm free length and a progressive spring rate of 205 to 290 lbs/in these will lift your empty ride height up you over 610mm and you could get driveline vibration at 35kph to 45kph and this would also increase you rake angle from 30mm to 45mm so this could cause ASCTC issues also. ARB/OME next spring up is a PN 2838 and it has a free heigh of 410mm to 420mm and the same spring rate as the 2938 of 205 to 290 lbs/in. So these would increase you empty ride height to to about 630mm and give a 50mm to 65mm rake so these are way too stiff.
Your requirement of empty EBH 595mm and 25mm to 30mm of suspension compression with 100kg cargo and 160kg towball (is actually about 325kgs of total load on the rear coils) is very hard to achieve and I do not know of a coil that will do this.
If anyone can make a spring that will do this it will be a Kings tapered wire progressive rate coil but I do not have all the technical data on these springs (yet) to do the calculations and advise. I am waiting on this info from Kings as "Apollo" also has similar requirements and this is very difficult (if at all possible) to achieve. "Ent" has custom medium duty TWPR King coils fitted to his Challenger and is about to fit heavy duty custom TWPR King coils in prep for GVM loads on his Simpson crossing and medium duty of the custom coils maybe the solution.
As much as it pains me to say, fitting airbags may be your only solution at this stage.
Sorry I cannot be of more help at the moment ("Apollo" has been waiting months for a solution).
OJ.
The rear coils PN 2910 are the lightest ARB/OME make with a free height of 370mm to 390 mm and a progressive spring rate of 150/260 lbs/in and these are giving you an empty ride height of 595mm EBH but when you are loaded up and have the camper hooked on, ride is reduced to 550mm/555mm EBH.
Fitting Peddars 5899 will help with controlling deep compression but these only come into play at EBH 535mm or less, and will not assist you earlier in your suspension compression or effect your static ride height. You would need a 30mm spacer under the 5899'S for them to give you the desired ride height when loaded but by doing this you will decrease the rear axle articulation off road.
Next spring from ARB/OME is PN 2938, 390mm to 400mm free length and a progressive spring rate of 205 to 290 lbs/in these will lift your empty ride height up you over 610mm and you could get driveline vibration at 35kph to 45kph and this would also increase you rake angle from 30mm to 45mm so this could cause ASCTC issues also. ARB/OME next spring up is a PN 2838 and it has a free heigh of 410mm to 420mm and the same spring rate as the 2938 of 205 to 290 lbs/in. So these would increase you empty ride height to to about 630mm and give a 50mm to 65mm rake so these are way too stiff.
Your requirement of empty EBH 595mm and 25mm to 30mm of suspension compression with 100kg cargo and 160kg towball (is actually about 325kgs of total load on the rear coils) is very hard to achieve and I do not know of a coil that will do this.
If anyone can make a spring that will do this it will be a Kings tapered wire progressive rate coil but I do not have all the technical data on these springs (yet) to do the calculations and advise. I am waiting on this info from Kings as "Apollo" also has similar requirements and this is very difficult (if at all possible) to achieve. "Ent" has custom medium duty TWPR King coils fitted to his Challenger and is about to fit heavy duty custom TWPR King coils in prep for GVM loads on his Simpson crossing and medium duty of the custom coils maybe the solution.
As much as it pains me to say, fitting airbags may be your only solution at this stage.
Sorry I cannot be of more help at the moment ("Apollo" has been waiting months for a solution).
OJ.
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