I know the OP has set their heart on a gas bbq, but after years and years of gas bbqs, here’s a punt for charcoal. We have one similar to this:
It folds completely flat for storage, gives a good cooking area (we’ve cooked for 6) and if you use self-lighting lumpwood charcoal it’s a doddle. Light the bag and it’s ready in about 15 mins. Magic.
As it’s a charcoal bbq, you can take it wherever you want to cook. Walk to the beach for a sundowner meal, perch it on a harbour wall, etc.
I knew someone would be on the charcoal train Not interested in charcoal in the least as for me there's simply no advantage whatsover.