If you want to see proper security round a house take a trip to South Africa (johannesburg area) you definitely would need to text the night before to clean windows there, you certainly wouldn't put ladders up to jump over gates you would be greeted with a shotgun and a couple of guard dogs and if you left your van open around the Durban coast the bloody monkeys would nick all your gear never mind Humans.
In fact, they wouldn't leave a gate unlocked for you. You wouldn't climb over a wall either as a lot of properties had electrified fences.
I doubt you could clean windows in Johannesburg either as you would be competing with the 'Ousie' and they are cheaper. Vans were few and far between. Most business was done from a bakkie although we had Toyota Hiace vans as delivery vehicles.
Those monkeys in Durban were unbelievable. When a troop passed through the neighbourhood they stripped the mangoes off the trees, took a bite and disgarded the rest. Really destructive. Brother in Law had a house in Durban North and the monkeys came through the weekend we were visiting them.