Anders has created this nice mod which enables you too really build a proper log bridge. What he did is up the numbers of logs you spawn when you loose a load. Which can then be picked up for bridge building.
Short logs: From 6- 20 lose logs when load is dropped
Medium logs: From 3- 20 lose logs when load is dropped
Long logs: From 2- 20 lose logs when load is dropped
And here is a end result. By Renxx from the Oovee forum: