I've sold mobile homes and toured countless communities, and I own one, so I can speak with some knowledge.
You will find variances due to the following factors,
1) Rent Control. The rent increase is limited by the city if the park is in rent control.
2) All age or senior. You will find the 55+ and 65+ parks higher in rent
3) Amenities. Some parks have higher end amenities, common pools, spas, parks, recreation rooms, etc. Also, are any utilities included in the space rent? This will increase your rent (think of it like a Home owners association fee).
If you are looking at a mobile home consider that there are three contingencies and areas of focus,
1) Financing: The age of the mobile will determine the cost of financing or not financing. 1976 and younger get better rates, under 1970 you may have to pay cash or very high rates. Most loas are 20-25 years (very few 30 year loans). Interest rates in the 7% up to 10%. Up front points are higher too.
2) Rental Agreement. You will have to qualify for the rent and the mortgage, typically your mortgage and rent combined needs to be in the range of 1/3 of your income. So if you make $3000 a month your rent and mortage can not be greater than $1,000 a month.
3). Qualifications. You will have to qualify for the community.
Restrictions; If you have children, young adults and pets you will need to verify that the community will allow this. Also, some communities you can not rent your mobile home, or have guest stay for extended periods. what is the parking like, and do they have options for RV storage?
Is the community under any possible changes, such as selling the park, changing from or to rent control? Will the rent change, how is it managed?
These are not all bad situations. Let's look at today's economy and why one may buy a mobile home vs a condo.
Average 2 bedroom 2 bath condo purchase price $300,000, at 5.25% interest per month based on 3.5% 30 year FHA loan (if the condo qualifies)
Your monthly Mortgage plus Mortgage Insurance $1,972, then add $612 per month for property tax, homeowners fees, and add in $ for your casualty insurance your total monthly housing total would be about $2,625
Average a 3 bedroom 2 bath Mobile at $150,000, at 7.5% interest, 25% down over 25 year loan,
Your monthly mortgage would be $887 and estimate rent of $700, add in casualty insurance and your estimated monthly housing total would be about $1,636.
By the way , there are four communities I love to share with people,
one is in Scotts Valley, you own the land but owners must be 55 and youngest 45, many have garages attached.
Another is in San Jose (San Jose has rent control), all age park, very nice community, rents are in the $500 and $600's some have yards and attached garages. The third is also in San Jose, must be 55 to own, youngest resident can be 18, rents around $850, many have yards, privacy and attached garages.
The final is in San Jose, rents are low, all age park, can have larger dogs, and you can rent out your mobile.
Hope this gives you some insight.