Just one last posting on this from me in case there's an idea that might help.
Fortunately for me, my garage is an outside building, with no second floor above.
So I had a bit more flexibility to raise the header. It was framed for a standard 6' 6"
opening with a flapper type door -- which made the effective opening even lower.
I was lucky in the sense that my header was one solid 4" x 14" x 18.5' with no sag,
and over 8" of superfluous framing above and below it -- all got ripped out and just
jacked that header up with new support and trim. I found a garage door company
that custom built a panel door and got that up high enough to be above the header
when open. All told opening is 7' 7" and can accommodate both trucks with "extras"
on the roof line such as solar panels and working hf antenna bases.
One thing I did consider was to just replace the header with a steel beam which
ended up larger than I expected to confirm with code but this may be an option
for some.

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