Congratulations on the new trailer and sleeping off the ground!
We had 'sand issues' this fall in Florida, but no blowing sand. We used 3 floor mats as I recall; 1 outside and 2 inside. Of course the sand had to be shaken off them quite often. Those reduced the amount of sand we tracked in, but didn't eliminate it.
VERY IMPORTANT: When getting into bed, wipe the sand off your feet!
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.