If I was you I’d call and ask them to justify that travel cost then. The other costs unfortunately make sense to me when you look at the market for solar installs. You shouldn’t try to price the solar vs the price of the roof but instead other solar installers as the only true similarity they share is they’re on your roof. The materials and skills required otherwise are not comparable and do not actively contribute to the others price. When looked at this way you’re realistically getting an installation for half the going price. It definitely isn’t cheap by any means but is still a deal compared to installing a whole new system once your roof is finished.