My friend gives lectures on the building... he was an engineer and dispatched to get it done as in punch it through as once it was blazed others would come and improve it... very entertaining and glad I had a chance to hear it first person on hoe the Alaska Highway came to be.
My opinion of Dozers is limited to my experience and self taught.
Years ago the folks were directed to build and maintain fire trails on their land after the 1991 Oakland Fire Storm...
Got a couple of estimates that were out of this world... more than the rugged property was worth...
I approached Dad and said how about we buy a dozer and I learn to operate it and put in the cuts to satisfy the Fire folks... Dad was skeptical and talked to someone with a large paving and grading company who emphatically said NO WAY... because of inexperience and the steep terrain.
Being young I did not listen and found a deal on a CAT D3 with 6 way blade and rippers... Dad and I split the cost of 17K with the Dozer being mine when the job was done...
I owned that Dozer 20+ years and put in and maintained all the Fire trails... and only reluctantly sold it because I ran out of work to do...
Just realized I have never uploaded a picture of the D3 so here it is.
Bought it for 17K and sold it for 15K... did a lot of work, had a lot of fun, being I owned it I could work on my schedule AND when ground conditions were optimal which I quickly learned the importance of.
Going over 20 years of ownership I average $150 a year in parts/supplies... mostly lines, oil, coolant, etc. and I replaced both steering brakes... tore it down under an oak tree and dug in... while at Peterson Tractor I was offered jobs while waiting at the parts counter... owners had equipment to maintain and I guess doing my own work was enough to strike up conversations.
I can't say enough good things about Peterson CAT... always made sure to get me in and out... made lines while I waited and let me use their private reference manuals... treated me like I owned a fleet of tractors instead of one.
About two years after selling the D3 my brother bought a ranch and needed Dozer work... said how useful my D3 would have been... so I started looking again and brought home a JD350C that had belonged to the Irrigation District... paid 10K
So far it has not needed any parts in 3 years but did have to flush the fuel lines and tighten up some things... tracks are good... rollers so/so
The D3 had foot pedal steering which I really liked and the 350C has levers... so between steering and operating the 6-way blade my hands are always moving...
The 350C is really like a mountain goat... the D3 can be a little tipsy with a higher center of gravity.
The smaller 350 takes a lot longer to move dirt but has done some nice work...
My brother has been offered 12k for the 350C from a neighbor so I feel we did OK price-wise... the Park Service used a lot of Deere 350 to build trails and I can see why.
Like Eddie said operating can be taxing... about 4 hours on the D3 was about my limit before I got Loopy... you don't want to go right when you meant to go left on the side of a steep ravine... so I would call it a day and be mentally done for the day...
Maybe being able to do my own work made the difference.... or I have just been lucky?
The D3 is not quite double the weight of the 350... so only natural it could do more.
A nice feature of the 350 is I can actually move it with my PJ trailer and my brother's Diesel F250...
As with most things tractor related... if you can do your own work so much the better.
The D3 also saved my life... was just going down the trail not doze and a huge bay toppled and hit hard... the CAT ROPS stopped me getting killed.