Call jayco with yoyr serial number ,usually you can get a schematic of the back wall free of charge, you will find on this where to mount the ladder
That's what I did and the blocks were exactly where the drawing said. Some TTs and 5ers however, do not have the blocking so it's good to get the drawing.
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2012 Eagle Super Lite HT 26.5RKS
2005 GMC 2500 SLT HD D/A