A couple of asprin
In serious though ..I tow around 3000 miles a year. .and all I have apart from the usual car tools..is a spare set of wheel bearings and the experience/ability to change them plus a can of tire inflator / puncture repair stuff.
I keep meaning to get a spare wheel and tyre but have been for the past five years
The tyres are in good nick though with lots of tread.
Hope my confession doesn't ruin my run of luck.. however I do minimise bad luck by servicing my bearings regularly. The trailer is unbraked and the load on it is probably only around 200kg
Looks like A1an does similar..so Im not a one of :-D