Thanks for the feedback!
I will look into screamingfrog for sure.
@Lesley - we are using a custom platform (in house) so we don't have that functionality. The issue is that we have a lot of inventory (millions) of cars. We have built (and are releasing new functionality today) to provide internal links so that Google can crawl all the inventory easily (users can too :). My question about sitemaps has boiled down to this: Do we need to build the sitemap to include every single page (all the inventory) or do we provide a "map" so that google can find the top pages and then crawl the inventory from there. Again the site is bestride.com. If anyone wants to take a look at the site, that would be fantastic!
Thanks