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I have a 2014 14DBS.  I want to replace the tongue jack.  It is affixed to the nose of the frame with three bolts, which is very typical.  When I looked under the frame to find the corresponding nuts, turns out the entire underside of the frame nose is hidden with boxed in welded aluminum.  Does anybody know how the bolts are screwed into the frame?  Are there nuts , or is there a backing plate that is tapped for the bolts?  My concern is that if I unscrew the three tongue jack bolts and there are nuts underneath, they will fall off into the inside of the boxed in aluminum reinforcing area and I'll be totally up the creek as there is no access to this area unless I were to cut the reinforcing plates , which obviously would be disastrous .  Any thoughts would be appreciated.