After all the comments on the mounting of the fuel tank, I made the following mods: 1) welded nuts to the frame to allow the bolts to be removed from the bottom 2) installed 1/4" rubber strips between frame and fuel tank to allow some movement during any frame flex 3) drilled larger thru holes on tank to allow movement and 4) installed bolts with safety wiring. I haven't decided if the straps are necessary or not.
Here is a pix of the frame with the bolts welded. The frame has 1" angle iron for the mount for the tank.
A pix of the 1" wide x 1/4" thick rubber strip. Obtained from McMaster Carr. Holes are punched. This is a medium hard rubber.
And a pix of the installed tank showing the rubber strip. The bolts are the original ones for now and will be swapped out when the safety wire bolts arrive (and of course add the safety wire). Will torque the bolts so they snug up but not overly tight so will allow some movement if necessary.
Thanks for everyone's comments. Keep them coming.
Russ