1/2 ton truck camper

All I can say is I probably am the biggest offender of being over weight 1200 lbs on a 1/2 ton. I would have never done this but needing a 1/2 ton for commuting persuaded me to get a truck camper for what I have. I looked at a few then since the one I wanted SAID 1770 lb I thought ok I can do that. I drove 600 miles to buy it, loaded it and brought it home, it felt fine going down the road. Then I weighed it, 2270lbs. It has worked for me, I don't know about a Nissan. All I can say is try it you may like it but beware of weight tags, they can lie.