The problem with the bedliner is that it will be difficult to apply and to cover everything. Also, if you go with bedliner I recommend a 2k catalyzed variety. I did the trunk of my dart with it and it turned out great. Raptor is what I used. It is tintable too so you can match it. raptor bedliner | eBay
It is easy to apply if you get the aerosol can. It cost a little bit more but goes on even and you can spray it in tight spots. Really should not need much. It goes on pretty heavy if you want it too. Easy to hid a F#@k up too. Like any other paint you have the learning curve. I think most of this stuff is good just have to find it's niche if you know what I mean.