If you keep your propane filled, fresh water supply up, and holding tanks with at least some space, you can find a spot somewhere
to pull in for the night, if an actual campsite proves unavailable........noting your 30' trailer.
The flexibility and freedom of this type of travel is an amazing feeling.....having your self contained little house on wheels, everything you need right with you.
We have stayed the night in WalMart parking lots more than once, but not routinely, and consider pulling in to restock, sleep and move on simply that....not "camping" at WalMart.
When it is very hot, or very cold, we like electricity.....but have done without in both, and lived to tell the tale.
Not caring much for "cold calls" at campgrounds, we like to call ahead and make sure there is something available. You never know when a campground might have been flooded, hit by a tornado, or had a major electrical outage that essentially closes them down.
If we know we are going to stay someplace a few days or longer, we have learned that researching reviews a bit is well worth the time. Not as important when you are passing thru and just want a spot for the night.
Be prepared, too, for some campgrounds being 4 stars and others being 1-2 stars. They are not all created equal, and we found it just didn't matter much as long as we had the water, electric and a dump station..
If the basics are there, but the surroundings less than visually appealing, close your blinds and enjoy your beautiful home away from home.
You are passing thru, not moving in.
I do believe that traveling comfortably, but with flexibility, is part of the learning curve, so don't try to have it all figured out at once. Decide what you must
have, and build around that.
If you don't have to have 3-5 point hookups each night, the road is basically yours. And, the best way to travel, in my opinion.