Sounds like you had it loaded right for tongue weight. Did you read the posts here on trailering, or are you some kind of professional?
When I first got my truck, there were plenty of fuel crud issues to work out; it, too, hadn't been driven for a decade or more. I didn't want to go all nuts replacing stuff, so what I eventually worked out is this: a sediment bowl just under the fuel tank (downstream from a big shutoff valve) catches all the coarse particles, and a glass in-line filter(generic, readily available, clamps into a rubber line) close to the carburetor catches the fine stuff. By looking at the glass I can tell when to take things apart to clean them, and in that way I've managed to clear the crud from the fuel system. Now I just keep her full of fuel to keep rust from accumulating. Of course, this forces me to drive the truck occasionally - even when it has no work to do - just to keep the fuel from going stale(that is what I tell my wife).
