The honest version of "does it integrate with my software." These are the systems this industry actually runs on, and what each one means for a build.
CDK / Reynolds and ReynoldsDealer management system
The long-established systems of record covering sales, service, parts and accounting, where integration is typically a formal, certified process.
Tekion / Dealertrack DMSDealer management system
The more modern alternatives, with materially more accessible interfaces and a faster path to building anything custom.
CRMSales
VinSolutions, eLead or DealerSocket, holding leads and the follow-up cadence that determines whether an internet lead ever becomes a visit.
Inventory and merchandisingUsed vehicles
vAuto or similar, driving appraisal, pricing and turn, which is where used car profitability is actually decided.
Service scheduling and inspectionFixed ops
Online scheduling plus multi-point and video inspection, which drive both approval rates and customer trust.
F&I and lender portalsFinance
Credit submission, contracting and funding, where missing documents delay money that has already been earned.
OEM systemsManufacturer
Warranty claims, incentives, recalls and reporting, each with its own portal and its own requirements.