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So.... is the house side 3 prongs or 4 prongs, more importantly how many wires were run there?
The National Electrical Code currently requires 4-prong dryer outlets in all new home construction. Existing homes may still use 3-prong outlets. The switch to a 4-prong outlet was due to a flaw in the 3-prong outlet design. In a 3-prong outlet, the ground and neutral wires are contained in the same prong.
The little difference is the how the ground (or neutral) appears.... as an angle or round or U prong? Tells you the NEMA configuration of the receptacle. Note that RV plugs grounds are all U or round shaped..... NOT angle shaped.
So don't do it directly, the mentioned adapters would fit any how. However, can you replace the house side receptacle with the proper one for the RV? Depends. IF you have four wires (black, red, white and green) inside the house AND they are all connected at the panelboard properly you can install what you need. But this is more of a local electrician project to insure that you have the 120VAC from black to white and 120VAC red to white with ground connected (4 prong).
If the wiring in the house side is Black White and Green in the cable you can still get this wired but would need to change the breaker in the panelboard to single pole 30A then install a RV receptible. If the cable is Black Red and white or green (older) as a 3 - wire then you would need to wire and relabel the conductors.
Or just use the dogleg to 30A to 20A and run a few items that you need to keep it alive. Can't run an A/C much on 15A, 20A OK for just one.
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