These are normal carpeted stairs- worked great- but it’ll damage hardwood stairs with the caps on lip of the step- it’ll pop the cap off due to the weight
I just ordered a brand new one today on ebay. $920 for the 440lb payload one. Mine has 3 speeds (low, medium and high). I hope it will work good for changing out 40 gal. water heaters.
It's been working great, as long as you don't have fancy hardwood stairs with little over hangs on the steps - but that's the same with any dolly honestly. I've been using quite a bit and it's been great
they're probably 24v or 40v battery packs, you should be able to rip out the batteries of a kobalt (24v) or ego/ryobi/kobalt 40v power tool and be good to go