Yes, you are able to use the MORryde X-Factor Crossmember # MR33WR but on the Correct Track front and rear hangers you would also need the Adapter Kit # MR93WR. I do not see any plumbing or other components on your 2018 Highland Range Open Range 374BHS that would prevent the installation of them on your trailer. Also the Equa-Flex can still be used. view full answer...