I've never seen an RV that didn't have low point drains... Could be a first, but, on FunFinders, they are usually located near the water heater. You should be able to see them under your trailer; they don't stick out real far and you may have to look close for them. On the FunFinders I've looked at/worked on, they are two pipes together, stick out just a couple of inches and don't have caps. When you locate them under the trailer, it will give you a better feel for where the valves are located. On most FunFinders, the valves are "pull ring" style. You will see the valves "T"d into the hot line and cold line (that's why they are normally near the water heater...the handiest point for installation as both hot and cold lines are side by side). They should have metal rings, similar to what you see for key rings. Simply pull them up, they'll lift a pin that allows the water to flow out. To close, just push the pin back down so it is flush with the top of the valve.
On some RVs, the low point drains don't have valves...in that case, where the lines exit under the trailer, you will find a cap on each pipe. Simply remove the cap and the drain will flow.
My 2 cents, your mileage may vary...
2 Cats; J-Lo and Ragamuffin :R
2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
2008 FunFinder X 210WBS (Sadly gone)