2017 host Mammoth triple slide

We just picked our up 3 weeks ago. Did 12 nights in it on the way home and no problems to speak of. Quality is way better than the 5w I had before. The only issue we had was the shower door rubbing on the bath slide going down the road eating away at the metal trim. Couple rubber bumpers should resolve that. The center of gravity I believe is further back behind the axle than I was led to believe. It picks up the front of my truck one inch which going by a previous scale reading takes off about 400lbs. This causes a little porpoising action over large bumps. My truck is an 05 f350 and the bed turns out to not be flat, some of which if not all is from hauling heavy stuff in the back beating it up a bit. A straight edge shows about a one inch crown. With all the weight to the back it flexes the frame even more so it's kinda leaning back in the bed with the front sitting higher than the back. Not sure how I'm going to resolve that yet.