viscount weight

My 82 Grand tourer is 15'6"(excluding drawbar and hitch) and according to the rego data weighs 800kg bare and has an aggregate of 1200kg.
I have no reason to doubt these figures, but if I was replacing springs I would assume the originals to be a bit on the light side and thus would increase the capacity to around 700kg for each side to give a total capacity of 1400kg.

I would also replace the shockies at the same time with a slight upgrade on the standard units.

Hope this helps.

Disco.

If the van was traveling happily..well more or less on buggered springs.
I would be inclined to count the leaves and replace with same.

Trailer springs are crude and hard at the best of times......putting unnecessarily hard springs under any trailer is probably not a good idea.

typically 5 leaf 45mmx 8mm springs are rated arroune 650kg per spring......going up to 6 leaf will get you up to 750Kg per spring.

It may be worth looking at parabolic single leaf springs.

cheers