Portable Power as EHU

[Steely]

Hi, i have two 95ah leisure batteries so i get 95ah total, and with solar on my roof in the summer i can go off grid probs 2 days maybe more pending usage.. I was going to buy a Jackery 1000V2 which gives out 1000ah. I know i can plug the van into the Jackery and use as an EHU, would this technically mean im able to get 2 days leisure plus then 20 days off the jackery? Theory being 95 ah lasts two days so say 1 session of 2 days followed by 1000ah ÷95 = 10 sessions so 20 days? Also i know i can also use the extra power in the summer to recharge the jackery via the van with the solar so could be even longer? Does this seem right? Does anybody else do this and am i correct or just being a bit thick lol