I guess a fitting like this:
Buy a Ring Premium Awning Light
www.leisureshopdirect.com
might conceal where the current has been fitted, but certainly the ones you describe are available:
Buy a LED Awning light with gutter
www.leisureshopdirect.com
I found them on the site linked, but they will be available from many outlets.
Presumably the present fitting is switched within the caravan, and I beleive that PIR versions are also available.