I installed a Fiamma F65s Awning. It mounts to the existing roof pins with a bracket kit for the promaster vans.
It’s nicely fit to the top and fairly low profile. Of course now the top of the van is lopsided 🙂
I also picked up a 3d printed mount that uses 3M VHB tape to secure the leg mounts to the side of the van. This eliminated having to drill any holes in the sidewalls. You can get them from Impact3D on ebay.