I found a private owner who live nearby that has a large carport he's willing to rent out for $100/month. Is that a good deal? 

Thanks!!

Those prices sound okay to me but I expect that going prices are going to be location specific.

If you don't have power and choose to disconnect your battery, don't leave it for long periods (months) without putting it on charge, it will self discharge over time. Better to remove it and take it home where you can put it on a battery charger occasionally. Or you can get a small solar battery charger to maintain it but that could be difficult if you're under a carport. 

Portland isn't hot humid Florida, you shouldn't need to dehumidify there, you have high relative humidity in the winter but the air temp is low so the absolute humidity is also low. Just keep the trailer out of the rain, you should be fine. 

Re insurance, check your policy and see if it covers you. Most storage yards do not cover you.  I had my RV broken into in NorCal and I was covered by my policy, the storage yard did nothing for me beyond providing a parking place in a lot with a chain link fence around it which was easy for anyone to crawl under. There was a homeless camp a quarter mile away and the RV yard was a convenient place to stop by when a little drug money was needed or to spend the night out of the rain. 

We use a product called Damp Rid.  It is a white flake material that is in a plastic ventilated tub and absorbs moisture.  It keeps our pod from getting damp or mold/mildew forming.  We use 2 of the tubs at the same time. We find it at Home Depot in  10 ounce containers and then refill from a 7 pound container.  It works very well. We check it weekly and refill as needed. We keep all windows and vents closed to eliminate as much humidity as possible--our area of NC is very humid this time of year.

We also store our pod at home and keep it plugged in all the time.  We cover it in the fall to keep the oak leaves from staining the roof.

Vann

Vann

Vann

I'm fortunate to have a hay shed to store mine in. A couple issues I see. A friend here pays $5 a foot to store his in an old warehouse for the winter. It is secure, fully enclosed, and heated at 40 degrees all winter but no power for the unit. It sits among many other units until most decide to pull them out in the spring. He can't use it once it is parked. You may want to use yours in all seasons.

I lived in Tillamook years ago for too many years. You will want some Damp Rid or similar. If you have power a small, efficient heater is great. If not the dehumidifier product for sure and checking it will give you an idea how often it needs to be changed.

I lived in Hatteras NC for many years, overlooking the Pamlico Sound and about 1/4 mile from the Atlantic Ocean. You don't get a more humid environment than that. I never used damp rid or a humidifier and I had zero moisture problems in my rPod when it was not in use. As soon as I occupied it there was all kinds of condensation inside. Breathing, cooking and washing was the moisture source. If there is nothing creating moisture in there then it will be fine. 

Damp rid and dehumidifiers are great for interior spaces that are connected to a living space where moisture is being produced but are kept cooler than the rest of the space. Even a small heat source will work because warming the air reduces its relative humidity.

Mine was to insulate the shed and put a small heater in it. The problem was that all the stuff in the shed would get cold (or cool) soaked and end up at a temperature below the point where the relative humidity reached 100% (aka the dew point) when warmer more humid air returned. When that air came in contact with the cool stuff moisture would condense on it. Of course, the fact that there was salt everywhere didn't help either. By heating the materials in the shed stayed at a temp above the dew point, and the insulation slowed down the warming of the interior of the shed so everything stabilized.

I didn't have the same problems in the rPod because it was already insulated and there wasn't a lot of massive stuff in it that took a long time to warm up, so everything warmed up at the same rate ,and there was no condensation. Never had to put a heater or dehumiifier in there.

The original discussion was about how critical it was to have electricity at a storage site, I'm just saying its not that important. Certainly, if you do have electricity where you store your rPod and you live in a damp climate it's not going to hurt to heat or dehumidify it, I just found it not to be necessary. Don't leave a bunch of cans or liquids in there while its in storage.

I don't believe that dessicants like Damprid will work either because its like the little dutch boy putting his finger in the dike, its not like rPods are tightly enclosed spaces so there is a lot of air exchange and too much moisture to try to remove that way. The more dessicant you put in there the more moisture you'll pull out, but I doubt you're putting a dent in humidity level. Dehumidifiers even small ones remove multiple pints per day. That would take a LOT of dessicant.

You might want to read this about Damprid. 

https://homewatchservicesetc.com/why-we-do-not-recommend-damprid/ - https://homewatchservicesetc.com/why-we-do-not-recommend-damprid/