I have a t4 with a fiamma rack that holds both bikes. the issue is in the living side of the van is i can get a 3rd in but no room for kit or when there is 2 of us all the minging kit gets put in the van festering.
I was wanting something like https://www.alibaba.com/product-detail/Top-sale-Trailer-steel-hitch-luggage_60478083814.html
which means all the shit high kit like pads, shoes helmet etc can be then put in waterproof boxes and not smell the van out and take up room.
thule do one but its not cheap, the aliexpress ones have a minimum order