Honestly, if you want 7 seats AND luggage at the same time, then a full sized mpv (or SUV) is basically your only solution for a comfortable long distance ride.. budget for those is another issue.

Most of the smaller SUV and mpv won't be able to do both well. Hell, on most compact 7 seaters, the 3rd row seats suitable for cats, dogs and small children

If your budget only allows for a compact SUV/mpv, then perhaps install a roof box.