just fitted a couple of 100 watt solar panels to my car transporter trailer to give my van a bit of a winter power boost! 4 position adjustable brackets and all folds flat nicely on the trailer bed when not in use. i have 210 watts on the roof of the van but no room for any more so my 375 amp/hr battery bank wasnt getting fully charged if we had 4 or 5 cloudy days in a row.