I have 3 crews, Crew A is 3 men, one KUV van for supplies, 3 CAT 308 E2 Cr excavators. They do STEP (septic) tank installs in 3-5 subdivisions. At $500 per move one way you can buy a nice used 80 size machine. I bought and paid fo 3 in the last 18 months.
Crew B is 4 men, one RAM 5500 crew cad with long wheel base and a ton of tools and aux fuel tank, one CAT 289D3 CTL, one ASV RT40 CTL, one CAT 305.5E2 CR mini ex, one CAT 308E2 CR excavator, one tandem axle equipment trailer for the CTL and 305, and IH single axle 4300 dump truck
Crew C is 5 men, CAT313 excavator, CAT D4K2 bulldozer, CAT D6R bulldozer Cat 299D3 CTL, IH tandem axle bucket truck, IH 4800 crew cab pick up. F350 crew cab flat bed with aux fuel.
One Mack tri axle dump truck and CDL driver, 26K tandem dually pintel trailer, 40k tandem dually pintel trailerto service all three crews and move equipment.
We started 7 years ago with the single axle dump truck, ASV RC100 and a CAT 304C CR mini ex. All the above except the 313 are paid for.
We do rent mainly excavator and hammers for the septic crew 2-3 days a month.