I remember seeing some folks wondering about a Spring rated somewhere between the original 1750 # and the Alcan 2750#. That was my only point. Some folks think the Alcans might be too stiff, but from what I am hearing this is not the case.
Here is something interesting I found from Lew. You can take their 5 leaf 2750 lb. spring and remove the small bottom leaf and end up with a 4 leaf spring rated around 2050 lb. But, he also said he knows of no one who has done this yet.
Also, I hope someone can confirm what Lew told me. Torque setting for 1/2" diameter U-bolts is 65#, and 90# for those with 9/16" diameter U-bolts. Thanks.