That is one of the benefits of owning a truck camper. Taking it off truck and having a vehicle to travel around in. I lower mine as far as I can to ground after removal. Additionally, I have adjustable supports that go on the ground near the front jacks to support camper and keep it from rocking. The front jacks are secured at the top only and rocking would loosen mounting bolts etc and cause an unsafe or failure down the road. Back Jacks have additional support to lower bumber on my unit.
Loading and unloading in not a race and as a matter of fact dangerous if you are not careful. I take my time at loading as the cargo box clearance is really tight on each side. So, their is only one and I mean one position of camper in bed.
I have a heavy Lance 861/side slide out on a GMC 2500HD Duramax 4X4 crew cab. I added air bags, hellwig rear anti sway bar [a must need] and Rancho adjustable shocks all around.
You have to see what is your load capacity of the truck is and that will determine the size of camper you can have. I've seen way too many people put the wrong campers on and either broke their rear axle or worst were too top heavy. I have the 6' 6" cargo bed that limited my camper selection also.
I would suggest you reasearch on Truck Camper Magazine | Truck Campers Go Anywhere
to get fully educated on this type of recreation.
I use both a motor home and truck camper for each type of destination and accessability. I am really hooked on Beach camping on Carolina Beach, NC. We get about 6 -12 of us to stay there with back entrance towards water.....way up from high tide mark too! Plus you will need a 4X4 chassis also. I attached a few pictures of mine on that beach. I have a built in generator that is noisy and the exhaust comes out in the back seating area. I have found the Honda 3000i Handi very quiet and economical to run, besides being only @ 70+ lbs.
It's really a fun adventure if you outfit and do it right!