QB Issue Resolution:

This would be hard to answer without seeing the records.  Were there any improvements to this trailer?  You should see an improvements asset acct.

You are correct, you should not depreciate more than the value.  Maybe your 2nd CPA can shine a light as to why he/she made these entries?

Resolution for Issue 'Negative balance on asset' available: Yes (Solved).
Source: Intuit Community forum.

Negative balance on asset: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for asset acct
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