I would not recommend a portable set up. They tend to walk away while you are out sightseeing. . .
It is easy to install it on the roof, so it can not walk away ever. I used 1/4" stainless steel tamper resistant bolts into 'nutserts'. You can google nutsert or check u-tube to see how to install them. Graingers sells nutserts.
I used 6" long angle aluminum to mount my panels (home depot)
I used grey UV rated wire #10 for each 240 watts, also from Home Depot.
SunElec.com Select a panel with a aluminum frame, they will run about $1.50 - $2 per rated watt.
Wire them up, run the wire down the back of the refrigerator to the controller, then to the battery. They will keep the battery full while in storage, leading to very long battery life.
Good luck,
Fred.