John - I don't know of any articles that discuss this style of financing that you're discussing. The reason being that financiers all tend to specialise in different areas of financing.
Most financiers, when financing used or new items of equipment, require either additional security in the form of freehold vacant land, or freehold land and buildings.
Some financiers - but only a very select few - will accept machinery or vehicles as additional security for lending. However, the very largest majority of lenders (probably 98%) regard "depreciating assets" (i.e. - machinery and vehicles), as having little commercial value, because their value is easily affected by their mechanical condition, and market conditions.
Land and buildings are assets recognised by financiers as having solid value - even if property values do fluctuate.
In general, if you own one item of equipment outright, and attempt to use your capital equity in that item as additional security for financing another item of equipment, a financier will discount that equity to nil value.
The financier will usually demand additional "hard assets" in the form of land or buildings as additional required security. In fact, many financiers are intent on acquiring a hold on vastly more security value than is needed for the deal being considered.
This is a standard technique amongst financiers - because once they have an additional, say, $200K in security to securitise say, a $50K loan - then the extra $150K goes on their books as a company "asset".
In other words, they are using the borrowers assets to boost their own lending ability. This gain in company "asset backing" often enables the financier to provide unsecured finance to other borrowers - at high interest rates, of course.
Any financier who might be prepared to accept equity in an item of equipment, to advance loan monies, will almost certainly discount the equity value to a very low figure, and charge high interest rates accordingly.
The more solid security you can offer for loans, the lower your interest rate charges will be - and the more that a wider range of financiers will consider your deal.