RV bed sheets?

If they exist Camping World probably sells them.
Sorry, best I can do.

We solved our issue by getting a real queen sized mattress for our 5er. See you have a TC when we had one just used flat sheets on mattress.

Check Amazon for "RV bed sheets". They list a bunch of them...

The missus fastened metal clips to elastic straps.

We use two of these to fasten the fitted corners diagonally underneath the mattress. This worked like a charm on our 5th wheel mattress; however, the mattress on the new truck camper is so thin we had to add a third strap to keep the sides of the fitted sheet from pulling out from under the mattress.

I bought some from Mattress Insider, quite happy with them. Even custom made a set for the Toy Hauler lift bed.

Look at the cheap ones at the big box stores. They'll fit.

Sheet garters. There's this sexy button-and-loop like what we use, or if you prefer there's alligator clip styles. Some just go across the corner like this (all we've ever needed), others made to hold corners, sides, top and bottom all together. We've found the ones with the metal loops are better, the plastic ones have a tendency to break in a few months. Bed-Bath-Beyond has both.

2gypsies wrote:
Look at the cheap ones at the big box stores. They'll fit.

Not in our house 700 thread count at the least.

dcmac214 wrote:
Sheet garters. There's this sexy button-and-loop like what we use, or if you prefer there's alligator clip styles. Some just go across the corner like this (all we've ever needed), others made to hold corners, sides, top and bottom all together. We've found the ones with the metal loops are better, the plastic ones have a tendency to break in a few months. Bed-Bath-Beyond has both.

We use these on our home mattress for the opposite reason, the mattress being thicker than the deep pockets. I always get the unenviable task of crawling under the mattress to do the buckling.