I would prefer the newer Ford van to the older Dodge, if used in the U.S. But for driving to Panama, I don't know which might be better for finding parts and people to take care of it.
I would rather do this in a van than in a Class C RV, which is a box house built on a van chassis. Probably better to live in, but not as structurally solid as a van.
If you will consider converting a van yourself, $10,000 can get you a used passenger van less than 10 years old, or an even newer cargo van, in the 50,000 to 100,000 mile range, about the mileage where these come off long-term lease. It won't be a house on wheels, but it doesn't take much camping equipment to make a van livable, and it is not expensive if you do the work yourself.