Our Journey originally had a dinette and an area containing a "euro recliner" along the right side of the coach. The fwd facing dinette seat had two seat belts.
When we replaced the dinette with a floating dining table, we also replaced the "euro recliner" with a love seat. (Process described with pics in the "mods and upgrades" thread) We took the dinette seat belts and installed them on the love seat.
For us, a piece of cake to drill three 1/2" mounting holes. We could easily access the bolts from the cargo holds to place the 4" diameter washers and nylocks.
As your dinette is in the slideout, underneath access might be a little more challenging for you. Outside two should be easy. I'm betting you can figure out how to reach the inner bolt!
Fair Winds and Following Seas
Terry & Rosalina
2007 Winnebago Journey 34SE
Retired Navy Mustang & Navy Wife