I hear ya about the diesel....the V10 Excursion has its own set of issues, the numbers actually work out worse because it's a lot heavier than the Sub but it will get the job done almost as well as the Sub will. Good to know it tows OK now, but remember that will change when you load the trailer and pack the family in the truck.
Your other option if you don't need 4WD is a 350 or 3500 full size van. Will give you more room than a Sub and they make excellent tow vehicles.
Something like this one.If you really want to go for the burb, put the youngest kids in the way back seat to minimize the load back there, and pack the trailer to manage tongue weight. By manage I don't mean minimize because a trailer too light on the tongue will sway. You want to be over 10% but not by much....pack the trailer and run it over to the scales and see where you stand. Keep the brakes on the trailer dialed up....
