Our
solar panel is fixed,
We've been thinking of getting a portable unit and have put some thought into transportation. we have a truck camper and space is at a premium.
In addition, while we don't have a portable panel i've a fair amount of experience shipping and transportation of artwork.
I like to keep glass vertical, and I would build a
light weight stand that prevents the panel from any kind of twisting force. just a small frame with a section of foam between the panel and the frame.
The biggest reason is it's less likely to have stuff put on top of it, if its vertical.
Or tossing it onto the bed with something to keep it from moving left to right or fore an aft, but doesn't put any force on the panel.
What I'm not crazy about with the bed, is that if it's raining and you don't have the panel outside. it's in the way.
That's one of the reasons we haven't yet got a panel is the lack of space to put it when we are inside the rig and it's not outside.