I'm typing this reply from a memory of some previous posts.
As I remember it, many RV park owners in Oregon do not want longer term renters because Oregon considers them leaseholders after something near 90 days. Most RV parks across the country operate on the same rules as a hotel.
Basically, the customer has no right to stay longer, that it takes only the owner refusal to continue the rental. If the owner knocks on your trailer door and says to be gone in the morning, you have to go. No way to challenge his right to tell you to get off his property.
Leaseholders though have legal rights, and have to be served with valid eviction notices.
Now this memory dates back three or four years, and might not be completely accurate. Also remember the laws are different in every state, sometimes even different counties and municipalities. And change from time to time.
I have had some park owners express concern about long-term site rentals in Texas. A couple have specific notice in their posted park rules that the park does not have leases or tenants. A stay can be terminated at anytime at the owner's discretion without citing a reason.
As far as RV parks in Portland, we stayed a week a couple years ago at a very nice park - Jantzen Beach RV, and it had several long term residents. I did not talk to anyone about their residence terms.
That park is located on the first island just south of the I-5 Columbia River Draw Bridge. If anything the warnings about traffic are a bit mild in my limited experience. Most of the time, it took 20 to 30 minutes to get onto I-5 Southbound and get off at Marine Drive - less than a mile distance.
Though I tend to believe geography is a bigger limitation on road construction than state or city policy. The Columbia River is a navigable waterway, as is the upper reaches of the Willamette to at least the I-5 bridge. Any new bridges or replacements will be multi-billion dollar projects.
Building new highways, or even rebuilding and adding lanes which require new property in built-up cities even under eminent domain is horrendously expensive.
The basic math is that if you choose to live in Washington, there are only TWO possible ways to cross the river on the way to work in/ near Portland. The I-5 bridge will be the heavier traffic almost always.
As with any major city on a seaport, even after crossing the main bridges, the local traffic will be extremely congested, with limited options if the rest of your route crosses a waterway.
Personally, I would seek to be someplace where I would not have to cross any bridges to get to/ front work.
The last reconstruction on I-30 east of Dallas added an hour each way to/ from work for me, for 18 months, as it crossed Lake Ray Hubbard.
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