We are building a robot for the FIRST competition and want to use the 3" track. Accordingto the documentation they can handle well over 100 lbs., our bot will be about 110 lbs… With this system work for our bot and handle the weight. The track length will be about 80" (36" length on side).
This is difficult to answer. I am not aware of anyone here doing anything that large. The tracks are used in police bots so I know they can handle a heavy bot. But the sprockets to the best of my knowledge have never been used on this large a bot.