We hooked ours up Wednesday night. Pulled the camper out of the barn and up near the house and plugged it in. Last night we filled it will water, food, clothes and put the bikes on the rack. Now tonight after work all we have to do it unplug it and hit the road.
We never leave the jacks down as I'm also afraid I'll forget to pull them up before we leave. Also, I don't think that extra day or two of having the weight on the truck is really going to make much difference in the life of the springs. Unless of course you are grossly overloaded.