We had a 3 series but had to sell it for that reason!!! We had a Maclaren side by side, which my husband (and other taller people) could fit into the boot but I couldn't - wasn't tall enough to lift over the 'lip' of the boot IYSWIM. We also had a Nipper out and about, which just fitted into the boot, but no room for anything else (travel cots, bags, etc).
There aren't many travel systems on the market fpr twins I don't think - have a good think about whether you actually want one anyway. I tended to leave the car seats in the car and just take the kids out and pop them in the buggy - couldn't carry 2 car seats anyway.
Good luck with the twins!





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