it wont hurt anything stacking them, welding them together isnt a bad idea though, as long as your not spinning your tires, and takein curves at like 80 - 90 mph you will be fine... Oh yeah avoid POT HOLES
I have a 4 and 2 stacked in the back, haven't had any problems out of them...just check to make sure they aren't shifting around on you every now and then and you'll be straight.
Id veer away from doing it..
no no, not worth the work/hassle
^^and what do you call yourself
im getting there tryin to build my self up
lol ya doin great, im tryin 2
ha ha no one can beat me i only been a member for like a month and i already got up to over 200 im kinda pethetic though.!!!!lol