What are the loads in the house: electric baseboard heat; heat pumps; AC units; laundry; other motor loads.I am failing to see why you would need a 400 amp service without a proper load calculation.There is no code restricting the number of sub panels, they only have to have the correct install and protection.If I were in your shoes, I would connect with a licensed and insured electrician and ask for electrical audit. 

I got lucky awhile back and bought a house this spring that in only a few weekends I had ready and rented it for exactly what I thought i could and it is motoring right along. 

I’m working on them, but they are at retirement age and want to buy a motor home and travel.

The issue is that carpet is not really a suitable material for outside of a shower, so the solution to the problem is really yours not the tenants....as in I would be hard pressed to expect that a tenant should be subject to an opinion of what is a suitable sized floor mat for outside the shower....There is a bit of a subjectivity to the discoloration i.e. if they walked inside with motor oil on their shoes, obviously that is not a 'normal' level of soiling.

In addition to the items you mentioned, I have the HVAC serviced every spring including cleaning the condenser coils, lubricating the motors as needed and checking the refrigerant levels.

I also met many people looking to invest through some of my hobbies (boating clubs, motor enthusiast clubs, etc) - so golf / country clubs are probably good too (though I don't belong to any either of those). 

Newer Roof, Furnace upgrades motor and plumbing, New Hot Water Heaters and 10 year old windows so I am assuming Capital Ex should be relatively low. 1st level - 3Bed 1 bath2nd and 3rd combined - 3Bed 2 Bath (And will convert to 4Bed when I move out)This would be my first purchase so I am very hesitant.Opinions and advice will be greatly appreciated!

Back in the day, it was the home of the General Motors Lakewood automobile plant. 

You may also want to call the state BMV (bureau of motor vehicle) and ask them too. 

After searching a few months, I picked up this 1999 Ford Ranger 4-door (all doors open) 4x4 with a 4L motor (gets 18mpg HWY).