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I initially went for Dobinson coils when i did my GVM upgrade. They were fine and got me thru the compliance test. When they sagged I went to them and asked for a suspension upgrade, gave them all the data above and they stared back like mullets - could not use it, went straight for the 'purple' section of the catalogue, so i walked out. years later I followed up with them and they had upgraded their technical side and when i arrived they weighed the vehicle,(front and rear) looked at and measured bump stop heights, assessed shockers, asked about my driving style, punched this into a spreadsheet then pushed the calculate key. out came two spring shocker combo's for the rear and one for the front. I aready had a matched setup for the front, so they swapped out the rear coils and it sat at just the right attitude, with zero psi in the boss airbags. i handed over my cash happily. Maybe give them a call. I went thru the dandenong Vic branch