In agreement with te rest of the posts really. I've done both courses and work both hospital and remote site as a nurse.
ATLS allows you to refresh, you go through the same process as thr Doc's but no qualification really, nice bit of paper with ATLS (OBSERVER) on it.
PHTLS is a probbaly more useful.
However Starlight is right. Primary care experience, advanced pathophysiology, prescribing, public health and some health and safety skills are as applicable as the trauma certs. It's right to have both but skills of a GP nature are what you will use on a more regular basis.