Tank Treads

[Griever102]

So My roommate and I are trying to build an electric cart to haul around our robots that we build. We have a frame that we are going to be modifying. We want it to be able to go up stairs too and we will have roughly 300-400 lbs on the cart. So what place would sell us good tread for this? We want it to be reasonably priced. We have two 24V motors to power it and if needs be we can add two other smaller motors to assist when going up the stairs.

Thanks!

KJ Robotics