I have considered those but IN MY CASE have decided against it
The major reason is my MH came with a cute little automatic awning, I'm not sure if this is better than the manual kind or not but it does present some "problems" so as to speak with accessories that connect to the awining, Stuff like the screen room you cite, my sun-shield (Basically one wall) and awning lights. I've solved the problem (more or less) for awning lights but they remain for the other items. This type of awning has a wind sensor and when the wnid blows more than x miles per hour (x is whatever the sensor is set to) it retracts the awning, your lights, your screen room, your sun shad your.. Whatever, Now if there is nothing connected to the awning, no problemm.
but ifyou have lights strung, and other stuff attached,,,, Major mess (My lights go on a special cloths line that is strung from support to support... it is sold as a cloths line,,, In my case it's a light stringer)
You can get a free-standing screen tent, this is a bit more wind-stable, but more work to assemble, and some places may consider it to be a 2nd camper (charge extra) I used one of those back in my trailer days and set up over the picnic table, very handy
