I'll stick with getting a technician to do anything needing a jack!
So will I with the caravan away from base, its all part of what I pay for. At home then its the faithful proper garage trolly jack gets used.
With the cars its different, the Golf if road conditions allow its the supplied "half jack" that I have used and found works well.
With the Disco, I am not as impressed with their scissor jack but again if road conditions are favourable I would use it. However, with the Disco its easier and IMO safer to use the trolley jack at home.
Direct lift jacks like in the OP are a danger with just lifting one side of a vehicle, the greater the suspension travel the worse so as this inevitably tips these types of jack.
I am not into carrying extra after market jacks, solo or with the van.