Will it fit (Hardtop) in Lexus RX450h?

[guruuno]

1st, I already ordered my parts, and will not have here in NJ until Sat/Tues.
2nd, I'd prefer not to take the Porsche on Rt. 80, not now anyway, maybe later sometime.

Having had done 5 roadtrips over the last 10 years or so with various cars, I'm not ready to do it in my Boxster, by myself, until maybe a year or 3 from now.

Thanks for all the help, so 40" opening works? (My wives Lexus RX450h has a 42" opening, and I was told it was a no fit/no go, so now I'm even more confused!?>?#$(*@$&