All the schools you are considering should provide you with great opportunities for graduate school. A couple of comments about Pomona. In many ways it seems perfect for you, because the atmosphere is definitely more collaborative than competitive, weather is pretty perfect, and the campus is compact and the classes small. Here’s a link to the webpage about disability services: https://www.pomona.edu/students/disability-accommodations/mobility. It even says that classes can sometimes be moved to first floor classrooms to accommodate students with mobility issues. On the other hand, very few students live off campus. A big part of the social experience freshman year is the “sponsor group” program which involves creating groups of freshman who are housed near each other and matched up with two sophomore sponsors. https://www.pomona.edu/new-students/guide/residential-life/sponsor-groups. I’m not sure how they handle freshman who live off campus, so I would ask about that.