A couple comments. Looking over the Lance brochure for 2002, Lance does advertise the 815 Lite camper for a shortbed full size truck. I think what makes it look weird is the lack of skirts which was an option for shorted trucks.
http://www.lancecamper.com/docs/2002-brochure.pdf
I would get better tie downs ASAP. The tie downs as they are fitted give very little resistance to rolling the camper out of the bed in heavy side winds or evasive maneuver.
If the truck is carrying the camper level with the stock suspension that is a good sign. With almost any TC upgrades such as sway bar, better shocks and quality tie-downs are key to safe and sane travel.