Best quality is going to be rigid panels with tempered glass.
No panel is going to be > 200W/m^2 (20% efficient and 1000W/m sun) unless it is a more expensive multi-junction cell. That would be thin-film or thin film on wafers, to capture the extra electrical energy from different wavelengths without as much heat.
Some panels weigh 50% more than others of same output. My 327W panels are 41 lbs/18.6 kg.
Heat is more of a problem if air is trapped behind the panel, becomes a solar oven. Ground mount allows air circulation.
Have a secure structure that won't blow over and break them. Top secured to side of truck, bottom held but a strut the truck's tires are resting on?
Or a hanger at top edge of truck, strut holding out like an awning? From the ground you could lift a panel to hang on a hook. But first put gussets on the corners to tie frames together - they aren't secure.
If you can stow (and pad for safe transport) panels that are 1m x 2m x 40mm and deal with the weight, quality commercial framed panels would be good. We figure the large expanse of glass wasn't meant for mobile applications, but maybe sheets of bubble wrap filling the space between stacked panels would secure them against vibration.
A charge controller that accepts high voltage would let you connect many panels in series. If one fails, just remove it and keep operating with lower voltage.
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