Have 3 inch clerance/new truck/ need 6 for level fiver

I'm looking at the same issue. I just haven't bought the truck yet. Probably those trailers with 15 inch tires are going to have an issue. Personally, I'm adverse to messing with my trailer to make it work. Currently, I have a 05 Dodge, which fits nicely. I was surprised at the 3 inch difference as well. I'm sadly looking at Fords. And to the usual "Google is your friend" poster: give it a rest.