I just found the below on this forum...so the 2178 does work on a Casita.
2019 17ft Spirit Deluxe with gray interior and the following factory options
Fiamma F45s Aluminum cased Patio Awning
15 Aluminum Alloy Wheels
Dexter High Lift Axle
Electric Tongue Jack
Andersen No Sway Weight
Video Entertainment Package w/ Cable Ready
LED Interior and Exterior Lights
25 Gallon Fresh Water Tank Upgrade
Modifications During Our Ownership
Installed Easy Start 364 Soft Starter can run A/C on low with a 15 Amp Extension Cord .
Installed BAL R.V. Products Group 24002D Deluxe Levelling Scissor Jack to replace factory rear jacks.
Purchased Proven Industries Model 2178 Coupler Lock
to secure trailer while at storage or in the campsite selling this with the trailer .
Purchased/Installed Zinus 10 Green Tea Memory Foam Pressure Relief Mattress MUCH better sleeping versus the Casita Provided Cushions .
Added two towel bars and shower curtain divider to the wet bath to keep the toilet area dry.