Don't front it. Collect every person's share upfront into one place the group can see, and book the house with money that's already there. The person who fronts an $8,000 rental is signing up to be a collections agency all summer.
Vacation rentals want the money early, a deposit now, the balance weeks before check-in. So one friend puts thousands on their card against seven promises to pay them back, and spends the run-up to vacation checking who has and hasn't.
Most rentals don't split evenly, because the rooms don't. The master with the en-suite is worth more than the bunk room, and the couple sharing a bed is paying for two. Rather than pretend it's all the same, set each person's share to match the room they're taking, the master pays more, the pull-out sofa pays less, and agree those numbers before anyone chips in.
Because every share is set in the open and shows on the record, the room math is agreed once, up front, instead of turning into a quiet resentment by day three. Everyone chips in their own number, the total still adds up to the house, and the group booked a trip together without anyone feeling they overpaid for the bunk bed.
The booker holds the money, directly, and the whole group sees every dollar, from first contribution to final payment.
The person who books the rental ends up carrying the whole deposit and then playing collections all month. Skip that. Everyone saves a card and promises their share of the house now, before you reserve, with no charge yet.
No card runs until enough people are in for the booking to be real, then every card charges at once, so nobody fronts the deposit and nobody can silently back out after you've signed. While the table is filling a person can take their promise back with no card touched, and it locks once it fills. That's the clean way to commit-now-pay-later on a group rental.