A new, lightweight camper with electric jacks is quite stable even if they are fully extended. I wouldn't worry - at all. Just make sure you load/unload on even (that is: not sloping) and firm ground.
The camper will still wiggle a little. Sometimes that is an advantage if you need to make small adjustments (less than an inch) while lowering the camper into the truck bed. Our camper fits very tightly so I frequently need to do that.
Obviously you wouldn't want to live in the camper off the truck with jacks fully extended and without further support.
It is really easy. Take your time and don't sweat it.
The Palomino campers are OK for the price but do not have the best reputation for quality. But I suppose you know that.