A large ticket is not a bigger version of a small one. It changes the limit, the reserve, the funding schedule and what happens if the customer changes their mind.
Card Deposit · Buyer Verified
Purchase Agreement · VIN
ACH · Wire · Delivery Evidence
Average ticket, highest ticket, how far ahead of delivery you take money, and what happens if the customer cancels. The gap between payment and delivery is the exposure — a deposit taken months before the work is months of chargeback risk the acquirer carries.
And what share of it you would want on a card. That decides almost everything else.