I would imagine it is fine. Pickup trucks have a good payload rating but once you install these two things you will then need to be clever with the rest of your accessories to ensure you do not go over the rating.
On stock suspension I would imagine you will get significant sagging in the rear end. You can maybe upgrade just the rear spring for some stiffer ones until you get the chance to install a proper lift kit?
Yeah, that's what I'm thinking now. I've had a few point out that once I load up my truck with my gear, plus that weight, it's going to be heavy. I'm already looking into upgrading my suspension.