"This may require me to use some carry-out portable panels that I feel are less than ideal (theft mainly)." IMO you will get tired of set up and take down of portable panels. And I'm not a fan flexible panels for heat and cupping reasons.
Most RV solar companies sell multiple sizes of rigid panels. 100 watt panels are not required. WindyNation for instance has 30 watt panels at 16x27 inches and 60 watt panels at 25x26 inches. Other companies have other sizes. Something will fit with enough watts to recharge your batteries.