No truck manufacturer is going to say "go ahead, modify the frame, we'll guarantee it'll be fine". How the frame was constructed is irrelevant.
No matter what mounting method you choose Casey, it's your responsibility. The only way around that is a factory installed fifth wheel hitch, and that obviously isn't an option at this point.
Dodge has basically said through their lawyers "hint hint, clamping would be the least error prone, but if you've gotta drill/weld, here's some suggestions". They're only suggestions, and I wouldn't expect anything more.
If you want to use that Pullrite, I'd just get it installed provided you trust the installer to do a quality job. That's the best you'll ever get out of this, and changing truck brands won't relieve you of any responsibility.
This isn't intended as a flame or anything, I've just been watching this thread and it seems like a lot of wheel spinning is going on to no useful end. At the end of the day, the story will still be "clamp if you can, have a competent person drill/weld if you must, either way it's not Dodge's responsibility".
That page out of the chassis manual carries no legal responsibility for Dodge.
Personally, I love my new hydroformed frame. My truck handles like a dream. I am more than willing to take the
exact same amount of responsibility to install a hitch that I did on my 2nd gen Dodge.
IANAL
Edit: Looks like Steve and I were typing out very similar posts at the same time.
