If you're building in the county and not in city limits (or their ETJ) then you're likely not on city utilities, in which case private utilities will be needed. Cases like this alone is a deal breaker for many here.
But just because there is a city ordinance allowing an MHP is not a red flag - in most cases it's not economical. More below.
The typical requirements for new MHP's - when allowed - are ridiculous. Examples - 2 homes per acre, homes must be brand new or under 5 years old, 22 foot wide concrete roads required with curbs, 50 foot setbacks with 14 foot concrete driveways, infrastructure for fire hydrants every 1000 feet, storm sewer, I can go on. The best use for land like this will never be MHP due to these ordinances. Unless you're building a huge community and can negotiate the ordinances in your favor then it's a non starter.
After reviewing the ordinances the question you need to ask the city is: "when was the last MHP constructed?" This will typically give you an indication their economic feasibility. Then you can drive through the park and find out their lot rent - then calculate a high level estimate how much they make yearly and compare that to the obscene development costs they likely incurred.