SeriesII suspension

I have a 1962 SII which I use to tow a fair bit. When I rebuilt it it the rear springs (bearmach) went flat in about 18 months. I fitted ( I think) LWB rear springs, the ones with the thick flat leaf at the bottom, and they got very tired after about 3 years. As I only do about 5,000 miles pa I think this is disappointing.
Have I simply made a mistake buying bearmach? I was thinking about putting the 1-ton back springs on it, but would they fit a SWB with a standard Rover axle?
If they do fit, could I also change the shackle plate and fit LWB shockers? I get sick of having to change the bottom bushes every five minutes.

is what ever yer towing weighted correctly. the springs should last longer than that(never has bearmachs so can't say owt about them) but i used to tow a full sankey trailer with a full landy and the springs never suffered.

Yep right, they shouldn't give you any trouble (the springs that is) maybe you can get industrial bearmachs, but my LR has normal bearmachs, and it's done a lot of towing, and no trouble presented

I've fitted 1ton springs to the back of a station wagon. to say the ride is firm is an understatement. My other landrover, a series 2a station wagon is fitted with Rockmountain parabolic springs all round.. I have covered thousands of miles with these springs on some harsh roads and tracks. They have the extra arch in them I was after. I was going to fit one Ton springs for this reason, but unlike the one ton springs and they are very flexible, progressively, so the more load you apply the stiffer they become. I have the heavy duty 3 leaf option. unlike other parabolics, there is no stray helper leaf on the bottom to get caught up on and they'll take all the loading you can apply with out bottoming. The improvement in ride quality has been fantastic and if your chassis is a bit tired they'll absorb all the blows
I travelled to Russia with them in 2000 and the following year undertook a drive to Tanzania ..but thats another story.
After 6 years their still going strong with no sign of sagging!