Chocks........ Harbor Freight, everybody uses them.
Do NOT buy the X chocks until you have camped some. You need to see if a little movement in the trailer from someone walking bothers anyone. If so, consider the X chocks, otherwise don't bother. I bought them used, They do work but I don't notice any trailer movement. My travel buddy suggested that if I had someone with me, yes, they would, Dunno. Wait and see. BTY, they are not wheel chocks, so you still need regular wheel chocks. I keep two in the trailer and two in the truck.
Rhino Hose is probably the best choice for sewer hose. Most Walmart Superstores, especially in areas near vacation spots, have lots of RV stuff. Get the hose, patio mat and water hose there. Best patio mat is polypropylene like ski rope and will not hold water. WalMart has some nice ones in the store. They have nice creases in them as packaged and are easily refolded and stored. I have a smaller patio mat I also use if I do not have a need for the large one.
Get two plastic containers with good latching tops, or what I switched to were the clear ones with hinged two half tops, nothing loose, nothing to blow away. One for sewer hose and attachments, one for fresh water hose and attachments. Get the tallest tote that will fit in your storage compartments.
Forget about the rear bumper hose storage. I am yet to see a sewer hose that will fit inside a 4 inch square tube bumper. If one does, you probably do not want it, and a Rhino hose certainly will not. Besides its not good for the bumper (rust). If you don't like the container storage for the sewer hose you can get an under chassis storage tube made for the purpose. It is telescoping so it will fit easily.
Valterra RV Sewer Hose Carrier - Adjustable - 34" to 60" - Black
Sewer hose comes in 20 ft sections get one and get a 10 ft extension and don't open it, you may never use it.
Get the version that the clear elbow is removable, hose will have bayonet fittings on BOTH ends. I got the one with the clear elbow made on the hose and am restricted in what I can connect to it.
The newer Camco blue water hose is better. The white ones kink easily and are frustrating.
Also get a Zero G hose or other brand that collapses flat, at least 50 ft (find plastic caps and plugs for the ends.) I coil my Zero G hose in a small plastic bucket for storage. Its good for filling when the hydrant is set away from the loop and you do not have water at the site.