I have the 31 bhds and if I level the trailer then run the slides out it is no longer level. I have learned to set up with the slides a bit high then send slides out and it is very close. I used a 4' level the first time then installed bubble levels on the trailer and that is what I use now.
2008 Jayco 31BHDS 2001 F-350 7.3 PSD SRW Lariat, airbags, overload springs, Class 5 reciever, Valley Weight DH. Dad, Mom, 1st son 16, 2nd son 14. ( BEWARE OF THE SHEETMETAL WORKER)