I test road a Checkpoint LS7 with the 1X etap. Also a Domane with 2X etap. First E shifting I ever tried. Neat but I'll stick with mechanical. I already have too many batteries. For the road I did not like the 1x. Heck the 11-34 Cassette that came with my Domane had too large of jumps between cogs for me on the road so I us a 11-28 and should have gotten an 11-26. But Eastern Va is not mountainous.
As for tires. Upgrade to something appropriate for how and where you ride.
Last search and test ride. The Trek site cxan be used to find what is in stock. Or order and if yo don't like it Trek as a 30 day guarantee. I've seem posts where someone put a down payment on two sizes and then bough the the one that fit.