it’s been no problem. But I put bulky stuff up there, not heavy stuff, and it sounds like that’s what you’re doing, so you should be ok. I have total faith in how I attached the skybox, but i did have to upgrade the support struts in the GFC too. which technically GFC doesn’t approve off because the mount points can shear off
I haven’t had any strut problems yet, touch wood. Maybe it depends on how strong you are and whether you can push up the roof evenly? Or when you close the roof I make sure both sides are fully down before I lock the levers in. Avoid twisting the roof as much as possible.