@Brian Bradley thanks for the detailed reply. To summarize, just to confirm I am understanding correctly;
Firstly, a DST uses estate plan trust Spendthrift provisions to provide comparable asset protection as an LLC with Charging Order protection. Therefore it sounds like a DST provides just a good asset protection as an LLC - which is great news!
Question: Has the use of a DST for real estate asset protection been tested in the courts? Has the use of series (child) DSTs also been tested in the courts, in terms of whether they can hold up against being collapsed into a single DST (assuming the trust is being managed correctly), or is this type of entity structure still too new to know for sure?
Secondly, from your second reply it sounds like the IRS Ruling 2004-86 does apply in that properties cannot be improved/rehabbed when within a DST but repairs and maintenance are ok. The workaround would be to complete a rehab in my our name - and therefore unprotected - then transfer to the trust once complete. This is not such good news for someone doing BRRRR like myself but guess its ok if you invest in turnkeys.
Question: If the first 'R' of 'BRRRR' cannot happen within a DST, what about the other 'R's' of Rent, Refinance, Repeat? Can you enter into new lease agreements or renegotiate current leases?; do a cash-out refinance of an existing loan?; and then purchase new property, all within the DST?