Backing up 26' motorhome without a spotter

[Backing up 26' motorhome without a spotter]

I am a solo traveler and fairly new being a full-time RVer. Some campgrounds have back-in sites only, or the back-in sites are more in my price range. Sometimes there is no spotter available to assist me in backing into a site. I want to know what techniques others have used to safely back -in. I have considered using an orange cone at the corner of the site (where a spotter might stand), and a reflective triangle or flag positioned outside of the motorhome to mark where I should start the turn out. I do not know how to attach the item to the outside of the motorhome so no water leaks start, and can be removed when driving. Any other ideas?

[MAC Won't Connect To Most Unsecured Wifis]

My MAC computer will not connect to certain unsecured campground WiFi’s.

The iPhone and iPad will connect.

I will try a Sprint mobile hot spot, at $50 a month.

I have just thought of a VPN, which can range from free to $ 12 a month or so.

What is best to override the MACs resistance to the unsecured WiFi?

[Using RV Park Cable TV]

I brought a tv cable from home, indoor hookup.. at the campground, the hookup is outside.  Is there a different tv cable needed for outside hookup?

[Winterizing For A 3 Week Stint At Service Center]

My motorhome is going to a service center for 3 weeks for warranty work in November. Some of the work may involve plumbing. Should the motorhome be winterized for this short stint. This service center is located near Cincinnati, Ohio.