Most sites yes. Some have more room then others depending on the size tent your going to use.
Yes. Most trailer sites are large enough to accommodate at least one tent, which generally is allowed. Extra vehicles will be required to pay for parking, with guest parking located just inside the park entrance, as opposed to the campsite. Some campsites are larger than others, so check with the campsite map. It is always a good idea to check with the park as well ,especially due to C19 regulations. Things can change as Oregon park rules seem to be in the state of flux accordingly. :-)
I'm not sure, but I would say check with the park:-).
Yes... contact the park
Yes
If you don't have a trailer you can have two tents if you have won you can have won tent and won on a trailer only spot
On most sites, yes
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