Our White Hawk has the queen-short and two 3/4 full bunks.  For all 3 we purchased Amazon's "Elegant Comfort 1500 Thread Count Wrinkle Resistant Egyptian Quality Ultra Soft Luxurious 4-Piece Bed Sheet Set" size: 1 QUEEN and 2 FULL ~ reasonably priced, great colors, and fit well thanks to the elastic around bottom sheet;  consider a good top/bottom protector like Camping World's "All-In-One Mattress Protector and Fitted Sheet";  and finally invest in decent padded mattress pads. If we decide on a topper for the queen, I think I'll go for the Costco "Novaform ComfortLuxe Gel Memory Foam Mattress Topper".
"I just go where I'm towed to"
Genealogy Community Social Group Moderator
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