re group: if rental property and car (or machinery, or any other non rental property ) is involved then they are not the same group and you need to separate. yours per description is all the same, hence single group .
are you doing paper form and not electronically filing your return? if so, you just put SUMMARY on line 1 and line 2 "see additional statements". no need to put dates
if you are using TT to fill F8824 then dates are required. TT does not recognize SUMMARY , perhaps it is a nice change on their software going forward as most 1031 are involved either up to 3 props or =/< 200% value of sale proceed. Anyway, you still put relinquished purchased and sale date. And you put the earliest identification date and the latest escrow closing date of your last replacement. just make sure after your 1st replacement, subsequent identification date must still be within the 45 d after sale of relinquished and last escrow close must be within the 180d. if you don't meet that, then you have multiple 1031 and need form 8824 for each. hope that is clear. check with you 1031 exchanger, they will know if you have more than 1 1031 or just 1, they know about those days requirement. also check with your accountant too. my suggestion is just a way to still use form 8824 via TT .
