x2 on using the regular sized sheeds and tucking them in. We have a queen and tuck them in. I just got a few sheets this week actually for our camper.
Not sure if you have one around or not but, we have an Ollie's bargain outlet not too far. It's similar to a Big Lots where they buy closeouts, etc. I got the same type of sheets you'd buy at Kohl's or other department stores for a really good price.
I paid $11.99 for queen sheets and $7.99 for twin sheets. High thread count too. Just a thought if you decide to go that route, look around.
My neighbor said she bought all her sheets at Camping World, I just couldn't justify myself spending the money to get a perfect fitting sheet when tucking it in would work for probably about a quarter of the price.
2012 Keystone Sprinter
Still sticking around for the good people and advice.