Helper springs

Does anybody recommend and brand of helper springs. I've added a 3 2 leveling kit and now waiting g for my shock extenders to arrive.
 
I installed the shock extenders on the rear shocks and the truck isn't stopping out when going over bump. I'm still trying to get the rear end up somewhat level.. he down about and Inch and the lost alot of payload. So I'm looking at Helwig helper springs.. I plan on towing a small teardrop camper trailer. What lb should I go with?
 
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