Wheeler's Rear Superbumps for 1st Gen Pre-Runner

I have a question about the rear Superbumps, I have searched numerous threads and can't find my answer and don't have the patience to wait until Monday to call them.

I have a 2001 Pre-Runner with all stock suspension and an ARE camper top, in addition to the topper, I run around with 100-200# of tools for work.

Are the Superbumps designed to help prevent sag like the Timbrens? With all of my stuff in the back, I have exactly 5" between the top of my leaf pack and the top of the frame where the bumpstop hits. Would I be better served by getting the Timbrens to help with my slight sagging?

I don't want to install different leaf packs because I don't want a lift and then I would have to buy more new shocks to go with the new leaf packs and I don't want airbags.
Thanks

 

No one?

 

I believe no, they are bumpstops and not load bearing as the timbrens or sumospring.

 

Thanks Lava.