ERF options for van/truck?

[SuperUnicorn]

Can anyone suggest any erf seats for me to look into please.

Must fit with seat belt as neither vehicle has isofix. Needs to fit in the front seat of a van (Izuzu Trooper) and the rear seat of an L200, which has the bench style seats.

Can't be anything that fits like the radian 5 as I can't tether it in either vehicle, as the one doesn't have a boot and the other it has to be on the front seat.

Needs to be suitable from approx 8/9 months. It would be a bonus if it was one suitable for a plane as it would make taking it away easier but that isn't a deal breaker.

We don't live near anywhere that fits seats, so taking two vehicles over an hour each way I would prefer to avoid if there is nothing suitable when we get there, hence wanting to research a few options first.

We have the Britax Dualfix in the car, which both my baby and I love but it needs isofix so isn't an option for the other vehicles he travels in.

Thanks in advance.

Joie every stage. Yet to find a vehicle it doesn't fit into and we've used it in a lot, including a couple of vans. Doesn't need a tether and it's quite light. We take it abroad with us, not sure if it would fit in a plane seat, we just put it in the hold. I can fit it in a taxi in 20 seconds, it's no more difficult than an infant seat.

Britax two way elite?