J&D: - We use our banana chairs similar to you and also find them handy if we go off road in the tent as a bed.
Just add a blow up air mattress for a good nights sleep.
Cheers - John
I agree with Rosie. Banana lounges are too low for Arthritic knees.
Several family members have the kind that Vic has posted from ebay. I've used them, very comfy, higher, and easier to get off. The only problem is they're a little heavier, and bulky.
I haven't tried the gumtree style one, but I can imagine hurting my bum on the side bar trying to get on it.