Probably not. The bulldozer and tractor by themselves will probably be more than that. By today's standards they would be several times more. A modern bulldozer easily weighs more than 40 tons. According to BT standards, a bulldozer will probably weigh between 5-10 tons.
However, it is a good start to start a village (not necessarily a full-blown colony) but it does seem to be missing a couple of things, most importantly a water treatment/filtration system.
UV Filtration and RO Filtration are fairly light pieces of equipment, even a simple still type device can purify water, with some charcoal and sand.
I agree though Construction Equipment alone would weigh several hundred tons, Couple Bulldozers, Couple Excavators, Some Backhoes, A Grader or two, Some drilling equipment for a well, and a crane. Then you get to farm equipment, Tractors, Combines, and all the attachments for Pesticide, Fertilizer, there is another 100-200 tons. Mining Equipment 100-200 Tons, Spare Parts for these would be another 100-200 Tons. Then maybe 100-200 Tons of Machine equipment to fabricate what you need. I am of the firm opinion, that for a 10-20k Colony you would need a Potemkin filled with Mammoths and Behemoths, and still you would be dependent on outside stuff, like petrochemicals for lubrication, fertilizer and pesticide, Medical Equipment and Supplies especially Drugs, and finally electronics.
In the 50's and 60's the US investigated Nuclear Propulsion,
http://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propulsion%29, and they were investigating ships up to 8Mt power by nuclear Bombs spit out the back of the craft.
