B&W offers all of these accessories to help you adapt for trailers that are close to the cab. I do not have any affiliation with them, just have used all of these products and found all of them to be very useful and functional.
Most trailer shops can provide you with a fifth wheel extender that replaces the original pin box and extends it out for use with a shortbed truck.
Here is an example of one, but there are a ton of them on the market.
Almost all of these options are relatively cheap compared to what you already have invested. Additionally they can be taken off and retained for your next trailer if you swap it out.
Hope this helps!