I remeber as a kid playing in the sandbox with Tonka Trucks. My favorite was the Tonka Dump Truck. If my memory serves me correctly I believe it was yellow although it could have been green (Yes your right its been a long time ago). I have done some searching trying to find that 70′s era Tonka Dump Truck.
The first Tonka Dump Truck was introduced in 1949 with the concept that the toys should be tough and long lasting. This is true as I put my Tonka truck to the test. Below are some great deals on Vintage Tonka Trucks.

vintage-1969-tiny-tonka-sanitary-service-garbage-truck-615 Vintage 1969 Tiny Tonka Sanitary Service Garbage Truck #615
US $19.38 (5 Bids)
Auction Ends: Sunday Feb-05-2012 8:40:55 PST
  | Watch this Item
vintage-1962-64-tonka-toys-aaa-pickup-tow-truck-excellent! Vintage 1962-64 Tonka Toys AAA Pickup Tow Truck Excellent!
US $129.00
Auction Ends: Sunday Feb-05-2012 8:47:59 PST
  | Watch this Item
vintage-mighty-tonka-large-dump-truck-metal-from-60-s-70-s-nice! Vintage Mighty Tonka Large Dump Truck Metal from 60's 70's Nice!
US $34.99 (1 Bid)
Auction Ends: Sunday Feb-05-2012 8:53:33 PST
  | Watch this Item
vintage-1970-s-tonka-dump-truck Vintage 1970 's Tonka Dump Truck
US $7.99 (1 Bid)
Auction Ends: Sunday Feb-05-2012 8:58:12 PST
  | Watch this Item
vintage-big-tonka-fire-truck VINTAGE BIG TONKA FIRE TRUCK
US $18.95 (0 Bid)
Auction Ends: Sunday Feb-05-2012 8:58:23 PST
  | Watch this Item