We have a 2017 Bighorn 3575el. We have been living in it since August. We love it. Well build, good CS support, and fair priced for what you get. It has a high roof line all the way back which makes it feel spacious. Also has a rear cap standard unlike the industry trend to delete the rear caps even of high end models. GD has never offered a rear cap and Montana's have to be order just so to get one.
With a SRW 3500 truck we were looking for a trailer with a lighter dry pin weight. At 39' 4" we start with 2435. Cedar Creek are also lighter on the pin. All but the smallest Cardinal and Montana are pin heavy.
Here is a link to what we have. Chris
https://www.heartlandrvs.com/index.php?option=com_content&view=article&id=307:bh-3575-elite&catid=97:bighorn&Itemid=380