You could put comments against the asset?
https://streamable.com/njakhb
Sorry it's slow, working from home via VPN and my machine is working hard processing some stuff at present.
But you could create a static group, enter in all your load devices so you had a reference point for each device, then using the comments you could see who it was checked to (plus Lansweepers last logged in user, history etc). Then just add another comment when returned.