If you just toss on a single in/ dual out muffler then you would need 2 sets of pipes made up to come off the muffler to clear the rear then back own to exit how you like. You can either order prebent pipe and make it yourself with some time, saw and welder or get a shop to bend it and install.
To give you an idea my truck's exhaust from new till now:
Stock
Stock Y pipe to SI/DO Delta flow 40 with dual out the back SS tips
Mangaflow Y pipe to single chamber SI/SO dumped before rear
Longtubes, no cats to single chamber SI/SO dumped before rear
Longtubes, no cats 14" race bullet SI/SO with stock rear pipe and exit (sleeper look)
Longtubes, no cats to single chamber SI/SO dumped before rear (second time with this setup)
Wifes 05
Stock
Borlia SS cat back system (got it for a steal)
I used to love the look of duals, but now im a fan of it dumped, makes the rear look cleaner IMO, and you dont see it as much as you see the dual exhaust trucks running around.