how much can it pull?

[Jarvis-69 GMC 1500CK]

I understand the rated weight from factory is pretty small on my 1500.

But if I do upgrades to my (Im talking all out, do any upgrade short of converting it to a dually) GMC1500 long box could I tow 19000 pounds gooseneck?

I was thinking for sure upgrading front/rear to airbags, my Diff is already pretty low (max 60MPH) and beefing up the 305 to a big block with a larger transmission. Obviously I will also need to look at brakes.

Me and my wife are looking at building a 45' tiny house, the trailer comes in at roughly 19000 pounds and I really hate new *anything* I understand in the end it would probably be cheaper to get a new truck, but I really dont want all the stuff that "comes with it" I.E electronics.

Essentially can I take my 1500 and upgrade it to something like a 3500? (Im In Canada - so I will take care of the legal bit I just want to know if its possible or if I should be looking for an old medium truck).