New floor covering base?

Is it wood or vinyl?
Home Depot has a bunch of options...or go into your local home interior flooring and carpet outfit.

Pre finished quarter round, available at any lumber yard either in foam or real wood.

Ours uses vinyl round bead welting, few examples here
molding ebay
One wall use vinyl reverse cove welting. Its still a welting where the leg is actually between the the 2 pieces. Works better though than the round bead which captures dirt. Still either if I were to replace floor Id have to cut off the bead as leg is stapled? Had to have been pre-applied before setting walls? No way to reattach even if I could find same color. Unless you have larger gap & could insert leg. Id be looking at something else, molding etc.

Wrote Lance and they replyed " picture and Vin please" we'll see.

Most call it "Gimp". It's the cheaper way to cover a right angle seam/joint and it's used by most RV manufactures.

Gordon White (Truck camper magazine) might know where you can find it.
(In case you don't read TCM, that is their pet peeve in RVs)