I've been telling people to NOT close on the first leg of your 1031 exchange until you've identified your upleg.
You are experiencing the answer right now.
Lack of time to find suitable replacement property.
It puts you in the unenviable position of not having the time to locate the best MHP/asset you could if you had more time.
You'll get pushed into ANY deal to save the exchange. Bad strategy.
Better strategy is to give your buyer an option on your property, but not allow them to close until you've found your upleg.
It's simple -- if the problem is timing (45 days to ID / 180 days to close) -> avoid the timing altogether.
Its a trap.
And I didn't even mention your due diligence period of 30-90 days.
OK, that's my suggestion.
Keep us posted,