A 'feeding platform' as mentioned above sure seems to enable it, at any rate. Bar that, I guess it would depend on other things, like if substrate was used for the arboreal and how keen the arboreal in question was to come down onto the ground to hunt. I'm not a big believer in the 'better make the enclosure small enough so that the tarantula can find its food' saying, and consequentally I do suspect most arboreals would eventually find a B.dubia shuffling around in the top layers of the substrate; but I never did any wide spread testing when I still kept B.dubia. I'm inclined to believe you though.Also, I don't see how B. dubia would not be a good choice. I've used them to feed arboreals, and they've thrived with them. .