Having done this trip this last May, the temps were great. Warm days 70 or so and cool nights about 45.
I like
Burlington Campground It is set in the Redwoods and has a visitor center next to it that has a gift shop and some really good exhibits in it from the early days of logging including a old truck from the era.
Sites 1 thru 18 and 53 thru 57 are walkup the rest are reserveable Sites 21 thru 33 are 33 ft or longer. as are 55 thru 58 but mid week it is mostly empty. As mentioned the roads are tight but I saw rigs larger than mine, 28 Ft, in there.
See Map There is hiking and a trail to the river.
In my
Profile you can see what it looks like. It is in space 17.