It was the smaller bolt in the rear of the holding bracket that pulled the threads out with the bolt.
Not sure if a person could fish something like that in without removing some of the front end ? Grille , bumper etc for access ?
When I get the MH back I'll slid back underneath and see what all is attached to the front of the boxed-in frame.
Yeah that was strange having to use a cheater on the breaker bar to loosen the front bigger bolts all the way out till about the last 4-5 threads then just had to use a ratchet to get it the rest of the way out.
Threads were clean, no rust, no thread locker on the bolts..
I had to re tap the rear smaller bolt hole and the frame looked very thin , maybe 1/4 inch thick ?? So tapping the hole only gets 4 maybe 5 threads , standard thread .
Just a guesstimate but I'd say the front bolts are 3/4 and the rears are 3/8 at least it was a 3/8 tap that I used to re-tap the hole on the drivers side.
If I remember right it was an 18 mm socket to take the front bolts out and a 15 mm to take the rears out.