I use stackable leveling blocks as you stack them they create a ramp then use the TV to pull or push the TT up on them (called Linx Blocks, RV store or Ebay etc) for side to side leveling there are lots of instructional videos on You Tube for this. Level side to side first then use you tongue jack for front to back then lower your stablizers, remember stablizers are not for leveling they will bend if too much weight is placed on them. For the bed we had the same issue brand new mattress, hard as a rock. We went o Costco and got their 4" gel foam mattress it's great we liked it so much we bought one for home.
Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.