“Bonding time” is not what I’d call a car full of kids on a long road tripThis sounds like the best idea... Until you pull into the gas station. I cringe thinking about fueling 1 100 for a long trip, imagine doubling it?
In all seriousness, splitting up the family into 2 vehicle on a family trip would take away a lot of bonding time. Towing a trailer off-road sucks. If I were in your shoes (and I've considered this with only 2 kids) take a look into the sportsmobile classics with a penthouse. They have the same engines as the excursions if you're looking for 7.3 or v10, can seat/sleep 6 without a trailer, and can probably handle all the trails you listed. They are kind of pricey, but if you're toying with the idea of buying an excursion, building it, building a garage, and then a tundra dd, you may come out spending less just buying a dedicated camper and using the 100 to dd.
Only other advice I can give you is you and your wife better start sleeping in separate beds, because your choice of vehicles are dwindling fast. Any more kids and you guys are getting into BIG money rigs
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