I'm relatively local to you!
Pros of a 2000 Excursion:
H-U-G-E inside....easy to build a bed platform with a real queen size mattress and still have room
Based on the F250, replacement parts and aftermarket solutions are everywhere
Solid axles front and rear, they're strong
Leaf springs front and rear, simple, and very easy to install that 4-6" lift you're considering
Hybrid dutch-door rear doors mean you can have bumper-mounted gear and still open the upper glass liftgate
So many bumpers available, you don't have to make your own. You'll even find them used
Originally available as a diesel, so a diesel conversion is easier. Even a Cummins swap
Cons of a 2000 Excursion:
H-U-G-E outside....probably okay in the MidWest, but there are lots of places an Excursion simply won't go or won't fit
Based on the F250 with leaf springs, the turning radius is atrocious. Makes it very difficult to navigate tight trails
They are very, very heavy. Over 1000 pounds heavier than a comparable Suburban 2500. This affects nearly everything
I'd stick with the V10, it's a good motor and doesn't lack power --- the Cummins swap is complex, expensive, and heavy. You'll never save enough in fuel costs to justify it
Welcome to Expediton Portal, and have fun enjoying it with your family!