Sorry for the delay in responding.
Yes, on my 2018 E450 I had to drill holes for the rear sway bar attachments. I did this, lying on my back under the camper using a right angle battery powered Ryobi drill. I went through several drill bits in the process because I kept breaking them.
Would I do it again? Yes, I think I would.
LandKo I know you have posted you upgraded your sway bars. I want to start doing the same with mine on etrailer the installation video is for a 2017 and 2019 E450 the 2017 shows them drilling holes but the 2019 uses holes already in the frame although at a slight angle. Did you have to drill holes to install. I want to do this at home but if I have to do drilling it might make it a lot more difficult than I thought.
This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.