The catalogue states that the HD (heavy duty) are for a 300-500kg continuous load. Sounds like you are putting roughly 150kg on the front and a non continuous load in the back. I suspect using HD's will be a harsh ride most of the time for you.
The HT on the front is interesting. The extra height might work to balance out the added weight in the front but I have no experience with them so I recommend checking it with Kings.
Sounds like I have roughly the same load as you though mine is maybe further behind the rear wheel than yours. I get some sag in the rear when fully loaded but it's not noticeable in the steering or anywhere else. The car drives so well that I haven't bothered doing anything about it. If I did, it would be polys rather than a HD spring. I think it could then be harsh when unloaded as you're required to keep a small amount of pressure in the polys even when unloaded. Happy with what I've got really.
The HT on the front is interesting. The extra height might work to balance out the added weight in the front but I have no experience with them so I recommend checking it with Kings.
Sounds like I have roughly the same load as you though mine is maybe further behind the rear wheel than yours. I get some sag in the rear when fully loaded but it's not noticeable in the steering or anywhere else. The car drives so well that I haven't bothered doing anything about it. If I did, it would be polys rather than a HD spring. I think it could then be harsh when unloaded as you're required to keep a small amount of pressure in the polys even when unloaded. Happy with what I've got really.
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