I think "Anvil" might be the hardcase you're looking for. I got a small 36" one for free that was formerly a sax case, and it's incredibly strong. I've used it to ship a take-down R/C sailplane on the airlines and it's as close to indestructable as I can find.
If I were you, I'd probably seperate my stuff into two groups- the firearms and optics, and everything else. Two trips to the car isn't so bad.
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