We try to include everything we might need (that doesn't rot or go off) including kettle, toaster, kids stuff, awning, radio, etc...
We've just used ours for the fourth time (we're still learning) and Sundays breakfast was a bit delayed as I had to open tins using a knife, we forgot the tin opener... doh!!
All the towels (bath, hand, tea!), shower gel, shampoo, conditioner etc. Tea bags, coffee, hot chocolate. All the usual stuff like kettle, toaster etc, oh yeah and loo roll!! selina
not been anywhere in ours yet but plan on taking things like kettle toaster tin opener thnx for remindin me lol and all the other stuff you'd need but i'm bound 2 forget summat lol
I hate packing, So i store everything except clean clothes on my FC. Having started out in a tiny tent, most of these are lightweight camping versions of things. There is a small selection of non perishable foods, toiletries, all kitchen equipment, duvets, cleaning equipment etc etc. Saves time at both ends, don't have to load it in or out, most things are in situ.
just mainly light stuff, like the main and awning lights, pots, pans etc, all the usual stuff.
try not to put too much in there because you need to consider the nose weight and overall weight of the trailer itself.