Maybe grind through the u-bolt on both sides of the u so there is basically two staight pieces of bolt with the u section removed. Then beat the bolt backwards through the trailing arm.
Not sure that works for you but it did for me.
Seems like a lot of my projects that should leave behind good leftover parts turn into projects that leave behind good leftover scrap metal.
I have been building piles of good leftover scrap metal for ahwile now and it gets easier to accept as time goes by.
GOOD LUCK,
JoeG.
