..and it's also 900 KB !
You are supposed to tow solid hitch to pull behind.. and solid hitch to the next one etc. I have my sled... a cutter and then my portable hut, all solid bar attachment. That said... we pull a second portable behind others on the lake up North all the time with just the pull rope looped over the first one. Only time we ever see the OPP and CO is when we are fishing... not when we are mobile.