For those carrying extra weight in the bed, are there any options out there for “stock height” HD springs? I’m wondering if TRX springs have a stiffer rate or not 

I’ve seen those, it’d be nice to have a stock height option so you’re not adding an extra 2 plus inches of rake in the rear when you’re emptyEibach makes one but it is not going to be stock height. The height will vary based on the weight of the cargo area.
Maybe someone will have air bladders you can install inside the springs?I’ve seen those, it’d be nice to have a stock height option so you’re not adding an extra 2 plus inches of rake in the rear when you’re empty
Those are good options, I’ve had good success with helper bags in the past. I think the biggest challenge with those would be to keep them properly orientated within the coils while maintaining full travel stillMaybe someone will have air bladders you can install inside the springs?
Chris