While its slow time, there's also the factor of people booking later than before so your bookings should increase as you get closer to those months.What I can suggest is that those monster cabins are struggling right now and new cabins coming online take some time to really hit their revenue mark. 

Then it could be quite different and just make the gate motorize, move in base and rent to trucks ( yes i get way over simplified), going to look for more resources on that possible route as the required capital would be drastically less for possibly a better ROI. 

Or in the case of appliances, who meets the truck, checks the products and signs for them?

I really should have had someone with a bucket truck or a couple younger guys.

You might see investors / main contractors hauling debre away in their pickup trucks late evenings and sunday... 

Very few succeed with this model and those who do are the contractor types who are driving around in their work truck putting out fires all day.

Save every penny you make, live with room mates, drive a beat up truck, house hack distressed properties and spend all of your spare time DIY rehabbing them.

Take pictures of contractor's trucks you see driving around.

even shipping costs from so cal to nor cal throw most scenarios for modular homes out the window. perhaps based on your experience you can minimize those drastically. 8k a truck load. 3 trips minimum. 

I feel like it needs to be mentioned that this is definitely not something I use for any legitimate issues, I’m not a complete monster lol.