Let's take a step back.
You've got five of these, how are you going to be connecting to the internet, over mobile data or wireless or wired?
They will be connecting via LTE only.
I now have OpenWRT installed with LuCi and opkg,
The issue is the flash is too small, ~9MiB, Tailscale extracted is like 27MiB
And if you create a custom image with integrated tailscale?
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I am not that advanced to compile a custom image.
Hmm I tried to compile like that but I get an incorrect checksum when attempting to flash it.
Flashing via the same process, power up holding the reset button for 3 flashes, then flashing via WebUI
Have you considered running the Tailscale Exit Node on the LAN side of the Router rather than directly on the Router?
There is no device on the LAN side capable of running the node. The device will be running on battery so the load and draw is crucial.
I did however get it installed, but I am just now woundering if this thing is actually going to have enough RAM to be able to run tailscale properly.
If you need an alternative, the Ubiquiti ER-X is a low power Ethernet only Router, it runs OpenWrt.
I guess connectivity is more important than VPN performance?
VPN is as important as connectivity as its purely for remote access, so without the VPN is useless.
But thanks all for the help, I gave up on the idea of trying to get Tailscale working due to the limitations of the device, and have gone for a Azure VM running Wireguard Server to act as a Wireguard Gateway.
Thanks again.
You could try Zerotier it does about the same thing as Tailscale with a considerably smaller binary since it is written in C instead of Go. I run it on many 16/128 devices.
Yes, ZeroTier worked perfectly, however because I could not set it up in Direct mode only relay mode the latency is like ~400-500ms.
If I could get Tailscale working that would be ideal.
That's typical for LTE on both ends with multiple layers of NAT. If your ISP supports IPv6 and you can get both routers to have a public v6 it may be able to go direct. Zerotier has its own mind whether go relay or direct and whether to v4 or v6 there isn't anything configurable about those modes.
To be clear, I was suggesting running Tailscale on the ER-X behind the RUT240 LTE Router. The ER-X/Tailscale combination is know to be deployed with Starlink in remote locations where low power consumption is important.
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Hello 
You can give this repository a try — it might help solve your problem. Although the storage size is sufficient, memory could be an issue. Tailscale is quite heavy.
[ADMIN NOTE: This is a new user and their builds are currently unknown and have not been vetted for functionality/performance/security (this is not to say that this user is untrustworthy, just that they don't have an established reputation on the forums). Please consider this before installing.]