Storage in Barn for winter.

If your trailer has a "smart charger" in it like the
Progressive line with the "Charge Wizard" then I would leave it plugged in. Our trailer used to sit plugged in 24/7 for about 12 years with no damage and the batteries lasted around 7 or 8. All I had to do was check the water level a couple of times/year - usually without having to add any.
There are other brands that have just about the same technology also.
You could use a stand alone smart battery charger like a "Battery Tender" brand that would work fine also if your converter is not a newer model.

No need to put wood under the tires. Just inflate to normal (usually max sidewall pressure) and they should be good for the winter. If the trailer was going to sit on the dirt then I would put something under the tires.
Barney

Unfortunately your question requires a "that depends" answer as it depends on the battery charging system. I see in your signature that you have a 2002 Gulfstream Seahawk 29FKS. Being that old it's highly possible that the converter/charger system is only a one stage. If that is the case then you can not leave it plugged in without boiling the batteries dry. If you can look at the converter/charger for a sticker or label and tell us the make and model we can help figure out if it's a 3 stage charger.

As far as the tires it makes no difference if you store it on dirt, gravel, wood, asphalt or concrete. But you might want to put the landing gear legs on some wood to prevent gouging or rust stains in the concrete.

I should have stated I just replace the converter in 2016 with the following Progressive Dynamics Inteli-Power PD9245C 45 amp Series Converter/Charger.

Then just leave the battery in the trailer and plugged in. The battery will stay maintained as it should be and ready for use next spring. :)
Barney

Thanks for the information.

On concrete that fresh, I would put some wood under it, at least for this year.

If on dirt or grass, yes put lumber under the tires for the sole purpose of keeping the tires from sinking. On Asphalt and concrete, nothing is needed, unless you just want to spread the weight of the camper over a larger foot print. Gravel is 50/50. It depends upon how solid the gravel bed is. If it's not very deep, and tires are subject to sinking with mud under the gravel, the lumber under the tires is probably a good thing. If it's packed solid and deep, lumber is not really needed. Previous house, previous TT, parked on gravel, always on treated lumber. Current house, one side on lumber, the other not. (the driveway has a 4 inch slope side to side for deliberate drainage one direction). So 5er needs lumber under one side to make it more level.

Plugged in? Ours? 24x7x365. It depends on your converter.

Something to think about? If the pole barn is an open barn, consider keeping the camper in ready mode, so if you want to spend week-end in it, you can. Power up the heat and enjoy watching television and sleeping in it. Don't need water. Take a gallon jug of water so if you need some, put a port-a-potty in the bathroom and dump in the house toilet every day, rinse and use it again, snuggle in bed with .... well... your choice ;) take some microwave pop corn and enjoy some time in it. Under a roof, the camper should do very, very nice in cold weather. Enjoy. Do dishes in the house, take trash out at the end of your weekend, and enjoy the camper throughout the winter this way.

Agree with Barney...both posts.

Jerry

BarneyS wrote:
Then just leave the battery in the trailer and plugged in. The battery will stay maintained as it should be and ready for use next spring. :)
Barney

Don't forget to occasionally check the electrolyte levels in the batteries.

I have a pole barn with a concrete floor. I do have staining from the preservative chemicals leaching out of the tires. It might be a good idea to always put down a barrier for long term storage. With the new concrete, using a board would spread the load.

I leave the battery in the trailer and disconnect the power cord so that it is not exposed to any power issues. The battery is turned off at the disconnect switch and I connect a Battery Tender about 3 to 4 days per month. A cord is wired to the battery to provide a quick and easy connection.