While not completely a-frame specific, I recently bought a Weber Q1000 grill, and love it!
I got tired of the cheap "rv-que" that never secured to the rails properly and didn't heat well. The Q1000 is their smallest grill, and runs off the small propane bottles. I thought I might try to get it hooked up to my trailer propane, but I have yet to go through an entire bottle and have made probably 8 meals so far.
There's something about it that just cooks well, and I've even been using it at home instead of my big grill.
It doesn't secure to the camper, but I got the stand for it and it all fits into the tub I added to the deck on my BH.
Anyway, if you want a small grill, check it out! And if anyone wants a used rv-que, I have one, though I don't recommend it!
2014 Rockwood A122BH
2014 Nissan Pathfinder