This was going back to the late 60`s.
It wouldnt surprise me to find others with loaded guns on that trailer.
I once saw a chap with an old hammer gun with an elastic band over the top leaver because the top lever spring had snapped.
Talking to gough thomas at a game fair he showed me an old 12 bore h/g that had holes in the barrels that had been brazed over by local blacksmith.
it had been in regular use until the old boy died.(of old age).
apparently he used to use it with the holes in the barrels but he had to wear a glove because the hot gasses used to burn his hand.
I remember my dads old 410 that had a repair done to the stock due to him running over it.
and my uncle dropping his chas osborne 12 bore h/g to run after a hare he has shot.he only had one cartridge .

(this was just after the war).
he caught the hare and walked back to his gun only to find he had dropped it on a stone and broke the ear off the left hammer.
I still have this gun made in-between 1870 and 1876. aged by Birmingham prof marks of "not for ball" on choke barrel.now repaired and re proofed for nitro.
rgds.DD