Price the complete arrival
Two tractors with the same asking price can have very different costs by the time they are ready for work. Put transport, an independent inspection, known repairs, and the implements you still need into your comparison. Use actual quotes where you can and label estimates as estimates.
A cheap machine with the wrong attachments may consume the savings before its first useful day. Conversely, included equipment only adds value if it is suitable, compatible, and in the condition represented.
Separate urgent work from future work
Ask the inspector to distinguish concerns that must be addressed before use from items you can plan for later. Avoid treating a serious fault as a bargaining opportunity unless you understand the repair scope, availability of parts, and who will perform the work.
Consider downtime as well as invoices. If your essential job has a deadline, a tractor waiting for a part may require an alternative arrangement you have not budgeted for.
Make the comparison visible
Use a simple worksheet: purchase, delivery, immediate work, required equipment, and an explicitly chosen contingency. The result will not predict every expense, but it will make two offers easier to compare on something more useful than their advertised prices.