So you don't have a pop top ? or even a campervan ? if your pride and joy is a Crafter, a Motorhome or a caravan then the pop top screen may not be ideal for you.  This freestanding tripod screen may be a better option.  
The roll down screen can either be fixed and hung using fixings on the top, or attached to the tripod for a freestanding option.  Great for inside and outside use. 
Please check sizes on image to make sure this will fit in your vehicle before purchasing.