As it turns out, the travel trailer frame is made of aluminum and the mounting screws are screwed into the aluminum.
So, will be going with option 3 at this time. I have found some 3/16" x 1.5" x 10" bar stock steel. I will drill and tap the bar stock for two 1/4-28 x 1" allen head bolts so they can be tack welded to the bar stock. After painting with some appliance white epoxy paint, will attach to aluminum frame with 6 #12 sheet metal screws.
Using #12 sheet metal screws will allow going to #14 sheet metal screws if the mounts work loose again.
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Larry
2015 F350 Ultra Lariat CrewCab Long Bed 6.7L
2005 Keystone Outback Sydney 30FRKS
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