Yup roads are good, a few switchbacks... but if you're a competent driver they will be cake
Yes. Very easy roads and all is clearly marked.
Yes, roads are fine. Make sure you know which campground you are going to there are 2 and they are 6 miles apart. Crooked River E-loop or Deschutes A, B, C loops. (Reservation paperwork just say The Cove Palisades Campground which is the whole park.)
I have seen it done, there are several camp spots down the winding roads. It may be slow going but possible...
Yes. The roads are paved and big enough to tow a trailer to the campground from Portland. A little iffy if you take it to the other side of the lake though.
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