i have 3 harbor freight solar panels i'd like to mount on my 85 hilo...they are about 12 inch wide and 48 inch long...what is the best way to secure them to the roof?

You'd have to use screws, I think, something like lag screws and possibly put them in a frame specifically designed for that purpose.

However, if they are the panels I'm thinking of, I believe you're wasting your time. I think they are rated at 15 Watts each, for a total of 45 Watts. In practice, if this is the case, you will generally see about half that output or a total of no more than 22 Watts on a good day. At a charging voltage of 13.5V, this only delivers 1.63 Amps to your battery. That's essentially a "trickle charge", and will not do much for you while camping.

I tried using 4 of the 15 Watt panels when I first got my HiLo and found them to be more trouble than they were worth. I had them on a stand that I could set up outside and orient perpendicular to the sun. They now live in the landfill.

If you want to dry camp and charge your battery with solar, you need at least two 100 Watt panels. I have three. They are lightweight, flexible and are held on the roof by EternaBond tape. I have a thread on my installation in this forum if you want to look for it.

- Jack

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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew

i looked for the thread and couldn't find it...do you remember if it was in general discussion?,,,also do you remember about how old the post is?..thanks in advance

One word of caution: My factory installed panel quit working so I removed it, at which time I determined the roof panel had several pin holes rusted through the metal. This was caused by dirt and debris that had accumulated between the solar panel and the roof. So I would suggest if you do install solar panels, install them on long enough spacers to allow cleaning.