I have the APT Superflex suspension from Ben. My 110 Defender wagon weighs about 2.5t. The bumb stop gap at the front is 160mm, rear 135mm. I got a 70mm lift in the front & about 16mm in the rear. Having said that Ben predicted the front spring height to be 335mm, it came in at 340mm. The rear at 320mm, got 340mm. 
It did sag in the rear because of the weight she is carrying, but Ben predicted that. And I have fitted Airbag Man CR5157 bags to fix that. I did not want a HD spring ride.
Ben also told me it would settle over 4 weeks. I have not noticed any yet and it was fitted mid December. But his prediction of spring height was very close. Which gives me confidence he knows his product. 
I am very happy with the ride and off raod its awesome. Definitely as advertised.
You can see for yourself on YouTube;
YouTube
YouTube
Have to say I am very happy with the support I have received from Ben.
Cheers Eric
Bookmarks