Sorry to be so strong about my opinions on this topic but this has been an ongoig issue with me for a couple of years. I originally had my panel as a portable unit & now a hard monted unit. Portable yes you can sunchase it & get optimum efficiency but you have to sunchase it [stuffing around with it every hour or so] & store it somewhere in your vehicle , pull it out set it up pull it down pack it away.
Hard wired - it's allways up there always on always getting power [i've even on a clear night got a little power from the moonlight]

2 cents worth.