Give it a couple of days soak in penetrating oil...


...then a 27mm socket and big ratchet.

If they dont move at first..soak again...then try 'gingerly' with a
extension bar on the ratchet.

As Billy said... taking the load off them will help.

BTW.. I have never heard of T/bar bolts shearing...
....so Fingers crossed for ya!

Jo