Thanks for pointing this out, Greg. The steel frame carries the weight of the manufactured home and is generally narrower than the home. Notice that in the OP's pic, the steel frame is resting directly on the foundation wall, so that spreads the weight and, as everybody has said, there should be no problem with those beam pockets. In cases where the frame is narrower, I think the transverse beams under the frame carry much more of the weight than they would in typical home construction, where the walls of the home rest directly on the foundation walls. I dug up a couple of pictures that show this. The OSB walls of the basement are more for skirting than support. One pic shows the end of an I-beam resting on the plate, not very well supported. I think most of the load was on 3 8X8 wooden beams with central steel jackposts. About a 50 ft double-wide. Click to Enlarge 44.71 KB Click to Enlarge 67.65 KB