what's the payload capacity on your truck's driver's door sticker?
i bet it's really low with no tow package.
i wouldn't tow any RV, without a factory tow package, ESPECIALLY a 5th wheel.
and did you actually weigh the Nash's hitch weight or are you using the fictional brochure/website "dry" hitch weight number?
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC