Like the enclosed bedding? Check Amazon for (1) sleeping bag liners, (2) travel sheets, or (3) silk sleep sacks (I used these in my hosteling days, very compact and weigh nothing). However, not so good if you like kicking-off the top covers.
Personally, because we use duvets at home, in the TT we purchase from Amazon very lightweight (dry fast in laundermat) and cost-effective sheet sets in brown or beige (don't show campground dirt as much) and bed clips to attach them to summer or winter comforters. Perfect!
"I just go where I'm towed to"
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2015 White Hawk 25BHS w/Outdoor Kitchen
2015 GMC Sierra SLT 2500HD Z71/4x4 Duramax
Son's 2016 Ford F-150 Lariat SuperCrew 4x4 + gifted 1984 Coleman Sequoia Tent Trailer