The Inventory Trial Balance should be good enough for bank reporting. The Trial Balance and the Inventory Valuation by Period report both use the Inventory Item Warehouse History by Period file to get the beginning balance for the period and then show the activity and calculate the ending balance. This all works perfectly providing the history by period file is correct and it may not be - in particular with clients who have been on MAS prior to the 4.4 upgrade. There is a utility in Inventory that can re-calculate the history by period if needed but it can create errors as well. An interesting exercise is to run both the Trial Balance and the Valuation by Period report for the same date and see if the numbers match.
I'm not trying to bash either report, they are as good as it gets in the Sage 100 world. However, they are not nearly as solid as the trial balances in AP and AR. AP & AR use the trasaction and payment history to calculate the balances, inventory relies on the summary file (which in theory is based on the transaction history) as a starting point and this can create issues.