Yes, it should be called Alpenheavy. With water, propane, batteries, and other personal materials, I am at 4000 lbs
When I bought mine used I saw signs of two past leaks and the rubber roof was reaching the end of its life. So I coated the roof with
EPDM making sure I extended the coating up on the roof vents, over the seams on the end caps and over the seams on the side. Also gave the roof of the slide a coating.
With that preemptive action I have not had any leaks nor needed to caulk the roof.
In spite of what might sound negative above, I have been very happy with my purchase.