EULANT Foldable Portable Air Mattress for Sleeping,Car Rear Seat Mattress Extension Plate,Folding Car Bed Mattress,Increase Travel Trunk Space & Car Bed Camping Space for Car/SUV/Model Y/3

These two were essential for me: $60 - https://www.amazon.com/dp/B0CZ6WS6VC (blackout sunshades) $40 - https://www.amazon.com/dp/B0D5HBC1MY (rear seat extension)

Amazon sells a mattress extension for $40 https://www.amazon.com/dp/B0D5HBC1MY?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1 Works great with the Lost Horizon I have

https://a.co/d/6SRzgBN That should solve your issue

Looks great but looks huge packed down compared to the Exped Mat Duo. Also, have you tried using an extension like this one? Its gonna allow you to scoot the Exped in more