My market's department charges a base amount per unit and then water usage results in incremental increases.

you may have to include it just hike the rent to cover the highest month usage of the year..

For example, a vacation home that’s rented for 180 days during the year and used by you and family member for 60 days falls into this slot.Personal usage includes use by you, other family members (whether they pay fair market rent or not) or anyone else who pays less than market rent.

of course take that with a grain of salt your the investor .. you use US agents to find you deals not to do the math for you and calculate your tax strategy.  

If these are ones on wheels they would be more closely aligned with Recreational Vehicles and land usage can be tricky as I believe you may not be able to keep them in a place for more than 30 to 60 days.  

Many older multi families do not have separate utilities, so you will either be stuck paying for the tenant's unlimited utility usage or you will have to go through the monthly process of dividing the costs and billing each tenant.

I think there's two options here and I've done both.1) Charge a flat rate for utilities but do the history on the property and make sure it covers the average monthly usage + 15%-20%. 

note, this does not mean just any "computer tech repair guy," UNLESS you can confirm/qualify that they know how to properly setup a router for tenant/customer/third party usage under your internet account.

If an agent acts inappropriately, that is not indicative of the lack of broker oversight. 

Prob is there's not much around me at the moment and whats being built is awful from the standpoint of design, land usage, etc etc.