Hi Marumi. Solo is the way to go but as you say it can be lonely sometimes, however, the benefits of being solo outweigh being in a group. Using suction cups to fix the tarp to the car roof is a good idea but the success will depend on the quality of the suction cup. I use a tarp size 4x3m erected on 6 height adjustable poles to create an independent covering. It covers the car and leaves a useable outdoors area of 2x3m This allows me to use my car for a trip without having to dismantle the cover. Nice video with sights around the campsite.