[JRTJH]

Often times, on new trailers, the caps for the low point drains are shipped/stored in the outside compartment of the water heater. Many owners and dealers just "follow through with that storage location" and it's become a "first look location" for missing low point drain caps.

So, check your water heater compartment, you may find the missing caps there. If not, ask your dealership where they are. They're a part of the "delivery package" and the trailer is not functional without them.