BONSALL:
A photograph exhibited in the New Orleans Museum of Art’s “Photography and the American Civil War” exhibit, reveals that Bonsall also ran a mobile photography studio of his own. The image displays a large tent identified as the “Headquarters for Photography,” and shows a soldier outside of the tent, gazing at what seems to be a portrait of himself just taken inside.
Tent Studio Photo:
https://books.google.com/books?id=0jhb_s3dcPgC&pg=115#v=onepage&q&f=false (ambrotype of Bonsall & Gibson's tent studio)

Bonsall’s obituary claims that he continued to run a photography studio in Kansas after the war, and city directories from Cincinnati, his birthplace, claim the same (https://19thcenturylives.org/tag/itinerant-photographers/).

More info:
http://www.vintageworks.net/search/detail.php/2/5000/100000/150/13917