Problems with a New Camper

Thanks for all of the input. Unfortunately, it has now been over a month since I took it in for repairs, and I really did not look at it very closely before I took it. However, it did not take much of a look to see that water was puddled in the middle of the roof and was 1/4" deep or more against the seal. The leaking was at the sides of the slide, so water was evidently leaking past the seal and then running along the inside of the roof and down the walls. When we tried to retract the slide the next day there was still water on the roof and this also began to leak in along the slide walls. We slid it back out and I mopped up all of the water with a golf club and towel while standing on the electrical box. When I get it back next week I will look under the seal and also check to see if it makes good contact with the roof in the center. This is our fourth travel trailer, and have also owned two pop ups and three motor homes, but this is our first slide-out. Wondering if the added complexity is worthwhile?