car is on gas (ie, extra weight) and the spare is mounted on the RHS. It is sagging, about 5mm more on the right side.

Now, I'm about to fit a towbar which will be used to mount a bike carrier, and I'll put 4 bikes on that. All more extra weight. Because of the sag I plan to fit stiffer rear springs. Pedders have quoted $310 fitted.

The question is: should I get them to fit a spacer on the RHS? They have 10mm spacers. But once the new rear springs go in, the sag, and the extra sag on the right, should disappear, I think (am I right?). But it will still have the uneven weight of the spare.

Any thoughts, anyone?

as everyone says, dont go pedders, they will go spongy in about a year or so, try and get stiffer kingsprings if they do them, you could even try airbag shocks (pump them up at a servo type) then not worry about changing your springs?

do you mean Polyairs?

do you mean Polyairs?

yeah, whatever they called

Also, 40psi in the back tyres.

+1 for King Springs. Never known of anyone having problems with them.

Hey mate I just fitted my TJ wagon with heavy duty Kings in rear/ std kings in the front & it fixed all my rear end problems I had with the car. Also I did replace the shocks all round with Boge. Kings are the go imo never had a problem with in any of my cars..

IMO, the air shocks are not the answer, air shocks are really good when towing and the one valve services the two shocks via an Equalization line that share the pessure evenly between the two, pumpint the other side up when an uneven load is placed on the car. The recommended setup for air shocks when not towing is remove the equalising line and run two valves, and putting more air in the heavier side of the car will not assist it road hold capabilties, it will only impair the car when cornering.

Kings are great spring, but really let side down in a laden vehicle. When you are by yourself they are awesome, but with 4 people in the car, they sink heavily, and could easily damage a strut or steering component, particularly with lows.

The dobson springs are 25% thicker according to our members, and would well be worth a go in this situation, backed up by a good reputable Multi valve shock.

The uneven load is just something that have to live with, there isn't much you can do about that and still have evenly pressured shocks and compatible springs.
Other than a spacer in the offending corner, that spring will compress more, but if its made well, the resistance should be fairly even at different compressed heights.
A shock works that same no matter what height its at, as long as there is still travel available.
I would not recommend lowering the car, if your go down this path. A small drop maybe, but not lows.

I don't see a problem with going Pedders. Half the time with their springs if you scratch off the red paint there will be some yellow paint under it.