Yes, definitely you can find construction equipment at auction. Check your classified section for sales in your area. Schools, plants, and construction companies are always replacing old equipment and selling it at great discounts.
You need background in both sales as well as knowledge of the equipment being sold. You can find a full list of job descriptions by visiting http://www.job-search-engine.com/keyword/construction-equipment-sales/
Information about case construction equipment can be found at a hardware store or a home improvement store. Check Home Depot or Lowes. Ask a sales associate, who will know about the needed equipment.
With the growth in real estate and infrastructure, there has been immense demand of heavy engineering equipments. This encouraged most construction equipment trader to setup IT enabled back office sales support centres. Hence you will not face any issues on after sales support.
When you are looking for construction equipment, l would recommend the comparison sites like ebay and amazon. Many construction supply companies have accounts there, and customer feedback is useful in helping you to decide where you can find the best deals on construction equipment.
One can find heavy equipment sales at various auctions which are held throughout the year. One can also find heavy equipment sales at online auctions such as Ebay, where sellers will often sell them outright as well.
Reviews for construction equipment can be found on the Construction Equipment webpage. Alternatively, many hardware stores will also have web pages that post consumer reviews.
"In order to become a construction sales lead, one would just have to find the right website to list their specific job. This would cause construction companies to find you as their lead."
The benefit of taking part in a construction equipment auction is that you can find construction equipment cheaper than in regular stores. Auctions are about bidding so with good strategy you can make bargains.
One could check local construction equipment stores for used materials. However, there are some online store that will help, too. To name a few, one could try RB Auction and Construction Sales.
Equipment 4 Rent is a Boston area Construction Equipment Sales Rentals Service. They have a website at equipment4rent.net. That would depend on what type of equipment you are looking for. For the simple do-it-yourselfer you can locate most of the equipment you would need at your local Home Depot. They rent items necessary for construction and renovations. If you are looking for industrial size machinery there is a place called Boston Construction Equipment that will rent larger items. Here is their website: www.equipment4rent.net/.
Wikipedia is as good a place as any, so I would start there at en.wikipedia.org/wiki/Heavy_equipment_(construction). Besides that, Youtube and equipment sales sites are probably your best bet, if you aren't aiming for on the job research.