395/44 is a good road, no major curvy sections, and only one downgrade of any significance is descending into Old Station. It is only a mile or so of steep but there is a stop sign right at the bottom. The rest of 44 is mostly flat. A long downgrade into Redding but it is gentle.
299 Redding to the coast is very curvy with no shoulder in places. Passing lanes and pullouts are not common. Safe for a larger rig, but a tiresome workout.
Avoid 36 from Red Bluff to the coast. Not RV friendly. North on I-5 to Grants Pass then 199 to Crescent City is a much better and easier drive than 299, but would be quite a bit out of your way.
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So many campsites, so little time...
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