@Dakota - walls are .100 It is 4.5 x 4.5 square. Frame is 2 I beams that run from rear to front. They are same height as tube. All welded. If mounting with U bolts I would place wheels central to I beams. So the T section would be lifted in unison. The wheels ideally will have a plate on top and bottom clamped with U bolts. My spare tire is mounted this way.
@ Lynnmor - this frame is ala 1989.
@ Barney - understood about clearance. But I was hoping this would help, not hurt in the event the bumper met pavement at any given area.
@piano - I saw deal on axle. I real don't want to go there.
@All - I am like 3 feet from clearance. I am taking all your advice into consideration. I did see good reviews on these skid wheels from people who have installed them. I will think on it some more. Thanks.