I'd say you did pretty good considering. I not so fondly remember my Lance mattress. It tried to get the best of me but sweating like a pig, I bested it and got it out. I used tarp straps. No way it was coming out without a fight anyway.
The mattress in my new camper is actually comfortable. The one in the lance was horrible, had a flat spot in it. Replaced it with one from Costco if I remember correctly. In was just as bad as out was.
What needs to be invented is a 2 piece camper mattress. Would make life easier (and less sweaty).
2015 Backpack SS1500
1997 Ford 7.3 OBS 4x4 CC LB