x3 on your fuel mileage hit being dramatic. That would be the deal breaker right there. If you paid $200 dollars to go on a trip before, it would be at least $400 with the Burb. AT LEAST double, figure that. $500 before, AT LEAST $1000 now. I know you said besides the fuel mileage in your OP, but that is everything -- unless you are rich.
I drive an extended cab long bed diesel Dodge, roughly the same footprint as your diesel. Your Ford will go anywhere the Burb will go. Take it out and use it, see if you are left wanting. Take care of the maintenance on your diesel and then some. My truck has 300 grand in mileage, runs like a top. Keep the fuel pump and injectors running right, lubbed and clean with a good additive. Air filter, hoses, oil changes, coolant, etc. That 7.3 Powerstroke is gold (I've owned one of those as well). As routine they go 500 thousand, met a few owners with that kind of miles on them. Take care of it, it will take care of you. Don't overlook the transmission. Keep it running on good fluid, cool, etc.
Keep the Ford. Use it and see what's up. Maybe there is some allure with the burb.. the big tires and lift, winch. But the Ford will do it all. Get a booster seat for the kid in the extended cab so he can see, a pillow for the dog to sit on so he/she is happy. Put a topper on it or get a cheap camper, then get out there. You will have more room with the truck, not in the cabin obviously. But once the Burb is loaded the truck would have had more room. And all around, the Ford will be cheaper to keep and use by a mile. And if it does break something, get it fixed and you know you won't have to worry about it ever again. Sorry to ramble, but the Ford is the keeper.... by a mile.