20+ years Army maintenance experience here... and put up with the 6.2's in in CUCVs (Blazers and pickup's), and both motors in HMMWVs. Absolute junk, and not comparable to "real" Detroit Diesel products.
They're niche engines that are actually kinda neat for being in an older, large SUV. Like dowmace and Super Dave said, just keep the engine running reliably, don't don't expect miracles from it, and remember that new gears are your best friend if you want more pep. You can get over 20 MPG if you have it set up right. Someone dropped a 6 speed in there and is reporting getting 25 if they go easy on the skinny pedal.
Check out Expedition Portal and see come cool burbs from mild to wild, and there are ones with the Detroit Diesels on there. It's also but dropped into Land Rovers before (though the Mercedes 300 diesel is as well). For the right price, I would take a 'burb with one and make it a nice, clean family 4x4 with some tall and skinny tires and gears, avoiding heavy plate bumpers and armor to keep it light. And honestly I'm a Ford/Mopart guy.
Sounds like you need an Excursion with a 7.3l powerstroke
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