The CE Smith trailer hub assembly part # CE13511 will work for you and yes you could reuse the dust cap you have now that has the rubber plug for access to the zerk fitting. Or you could just cover up the zerk fitting with the included cover as well. view full answer...
For your 2018 Roadtrek Simplicity built on the SRT chassis the best RV cover is the Adco SFS Aquashed part # 290-12210. This will provide the best protection as well as the easiest install and removal. view full answer...
Yes. The Classic Accessories Deluxe PolyPro III Heavy-Duty Cover for Class B RVs - Up to 20' Long # CA80103 will fit your 2018 Roadtrek Simplicity Motorhome that is 19 feet and 7 inches long.
It will fit on class B motorhomes with dimensions up to 20 ft. long x 84 inches wide x 117 inches tall. view full answer...
While putting a CE Smith Keel Roller for Boat Trailers # CE29505 on the rear most crossmember wouldn't hurt anything it wouldn't help much as like you noted that portion of the trailer will be the most submerged and by the time boat makes contact there the boat will be basically all the way on the trailer. I would put them on the front crossmembers. view full answer...
We have the Roadmaster spare tire carrier part # RM-195125 that would work great in the rear hitch of your 2018 Dodge Roadtrek Simpilcity SRT RV. This can fold down like you are looking for to allow rear cargo area access and was designed for motorhomes like yours. view full answer...