I'm sure I have seen an 'Illustrated London News' print of the Naval Brigade hauling guns, but I can't be sure. If I do remember correctly, it was just a leather harness, like rucksack straps. But I could be wrong, and I can't check my sources, as they are packed away.
The Naval Brigade did use camels on the Nile Campaign. I've read an anecdote, about them using tar to 'patch' the sores of camels. Not as bad as it sounds, as it contained an antiseptic, IIRC.