I would talk to a mortgage broker in the US who works with foreign investors and can explain your options, but I would also definitely contact Canadian banks to see what they can offer. 

Cah out can be used as an asset and for PITI reserves and a Heloc can "Never" be used as an asset or PITI reserves.I generally work out the options for my clients to compare a cashout to a Heloc so you can see payment to payment, overall costs and rate.

I plan to use Asset Based Mortgages to purchase the properties. 

Based on your market, you'll figure it out pretty quickly if mid-term is for you or not.

With your amount down, I'd say that house hacking or investing in a single-family rental are both solid options.

Besides hiring a realtor to do a traditional listing or selling to a "cash for homes" company, what other options might I have for finding potential buyers?

. § 1.469-5T(f)(4) provides that reasonable means for proving hours may include a statement of services performed AND approximate hours based on appointment books, calendars, etc.

I’m considering options like building a single-family home for STR or creating a small RV park with a few pads, but I'm open to other ideas.

From my research so far and conversations with a couple property managers it sounds like there is more upside on the STR/MTR side of things however it doesn't seem like Denver's government is very friendly to the STR/MTR option. 

You inspect, you may need to negotiate repairs or price changes based on your findings, the bank appraises it to ensure they can underwrite the loan, then you close.If you find yourself anxiously waiting, you can do what the vast majority of investors never do: educate yourself on how to manage a rental.