I just posted a report on our first 2500 mile trip with the 70C over on the B forum. Zero slide problems, but two notes: 1) make sure the driver's chair is fully forward before operating the slide, 2) make sure the outside water compartment door is closed before closing the slide. Our was cracked from the dealer from where some kid didn't check it.
As to laying/sitting, when one of us wanted to sleep and one wanted to read, we pulled out the bed and put the two front seats angled towards each other. One slept, the other sat in the chair with the feet up on the other chair. Worked better than I thought it would.
Niel & Carol Powers
Winnie Era 70C