I think you may have misunderstood what I was trying to say. You take a section of heavy pipe, like 3 inch perhaps, and run a heavy chain through it so it comes out the other end. You loop the chain hook through your tow hook, and hook the chain hook to the chain, then slide the pipe up agianst the chain hood, and pull the chain taut at the other end of the pipe.
Now you have a push/pull pole directly connected to your Bus. Now you loop the chain sticking out of the pipe through a hook on your push vehicle and do the same thing, pull the vehicle up tight against the pipe, and fasten the chain so there is no slack. You may need to shorten the chain, or you could connect the chain ends together, possibly using and additional chain, etc..
Basically, you have a tube (the pipe) with a chain through it, and attachment points at each end. If you push the pipe, you push the Bus, if you stop or slow, the chain checks you.