Most of the newer Crossroads models have the winterization kit already connected to the water pump and valves to the water heater tank lines. You will need to close a couple valves in the lines so that the antifreeze doesn't get sucked up into your water heater tank. The process has been well described on many threads here. Use the search method using "winterization" and you should find what you need. Good luck.
Steve & Sue
2017 Grand Design 297RSTS Travel Trailer
2017 Ford F-350 Lariat Crew Cab diesel 6.7 SW LB 11,500 lb GVWR package
Former: Crossroads ST26RB