I have 2 10s upfiring. No rattle. Great box. Totally happy with it...and I have had the 2 Concept subs since 2002! They don't make quality like they used too
I also have all Infinity top dash 2 ways, 6.5" 2 ways in the lower dash, and SSV adapters with 6.5" 2 ways in the sound bar, plus an amp and DSP behind the back seat. I do have a tonneau cover and bed/tailgate mats, but we also have a full-size Chevy with 8' bed for the truck duties around here.
I've been driving Wranglers for 34 years, and just traded my last one for my current 25 Gladiator Nighthawk. My last Wrangler was a bit of a lemon, and I don't know if I will ever buy another since I fkin love this truck! Anyhow, I haven't left the Wrangler forum yet, but if/when I do it won't...