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1. Is it possible to wire 2 100amp solenoid in parallel to handle the load of a single 200amp solenoid?

No. You will wire it up and it will work, but the very second one set of contacts gets a bit ohmic, most of the current goes through the other solenoid. Not good. At full load one will poof, followed in short order by the other.

You can get 200A solenoids cheap enough, Google is your friend.

-Bill
'87 4Runner w/ '96 5VZ-FE, 'Red Chili II'
'97 Taco XtraCab 3RZ-FE, 'BlackBean'
TLCA # 13257, Rising Sun 4x4 Club Land Use Coordinator
"He who stops being better stops being good." -Oliver Cromwell