My guns live at my home address like the way most of us store our firearms. I am lucky enough to have a nice static caravan as a holiday home on a friends land that has roe and red deer, rabbits and various bird shooting, meaning i am often here with friends or family and with more than a couple of rifles or shot guns. I also lease the shooting on the neighbouring estate / farm.
The guns travel up with me, and are here for the duration of my stay, normally a night or two, but sometimes up to a week or more. While i am up on a shooting trip the guns are in a hidden semi secure place, but not as secure as at home in my opinion, so the plan is to get a good little ammo safe initially, and secure this to the chassis of the van in a hidden place, under a bed or in a cupboard, and then ideally 2nd gun cabinet, in another rooms cupboard, again secured to the chassis if possible. Just as secure as i can make it. We have a few trigger locks, which are at best a visual deterrent, and have a bike cable for security, but that just means all the guns are together. I am not sure it would be a major problem for a knowledgeable thief. Though i have had the van for a few years now it is now more comfortable for longer trips and so the security now has to change. With the rifles and bolts or gun fore ends in separate places. I think this is quite adequate if we nip out for an evening meal or go shopping for supplies. The land owners home, his son's home and my wee place are all within a couple of hundred meters of each other, all fenced in and gated, all covered by the owners cctv. It is probably unoccupied with the guns here less often than home and of course when i am up there, the other guns are at home, but i am very happy with security there.
The van cannot be moved, it is secured to the ground and built in, secured with services like a house, water in, waste out, power and gas in, even wifi and satellite tv, so loads of pipes and wires underneath, and the whole thing is bunded / level grounded round, so moving without a crane is just not an option for this 36 foot unit, and we would notice a crane appearing! i have a wee fence round my compound, with my argo, chiller and quad in a container as one of my boundary walls to my wee compound. The land owner has cctv as it is a remote location, and so i think this is as secure as at home, and far more secure than in hotel rooms on trips as an example.
The guns are not registered to this 2nd location, but it has an address, they are just here for my visits and i see it as just like any other shooting trip, but with it being more regular location i am able to make some better security provisions in general than i would do visiting a non shooting hotel and locking the bolts in the truck and hiding the rifles under the bed or locking to a radiator. This has been well discussed here and i think is seen as an adequate and regular solution to security on a shooting holiday. I do leave an old springer sub 12 ft/lb rifle there all the time, and it just has a trigger lock and is secreted under a bed. I think this is probably legal, it has no easy access to juniors which is my understanding the legal requirement. It is very old, has yet to be zeroed and is currently more of a club than a rifle i guess, but it has a trigger lock and i have a wee key safe for the various locks, the gun cabinet lock keys would be in there when i am visiting, when i am not, then the cabinet and safe will be open.
I think speaking to the police about keeping the guns here from time to time, other than just mentioning the plans at renewal time would be overkill, i mentioned it last time, but just as a plan as it was not operational at the time. We dont log our guns to every hotel we visit, we simply make reasonable precautions and separate ammo, components and the gun itself, so as this is a regular location for me to visit, i think a low cost additional security is totally reasonable, though i dont think it has to be the same standard as the main home storage location.
The Op could follow a similar plan and i am sure this would be satisfactory. If they live 50 / 50 ish or prolonged times at 2 different locations then both would need to be logged and have the same minimum level of security, but for a regular holiday home type situation i think how i am managing the situation is quite adequate.