You have to check the installation manual for the furnace for this; there is a limit to how many elbows and how long of a pipe you can use.Some manufacturers have an outside vent cap (example:http://www.myhvacparts.com/store/media/products/ba... ) that has sort of a coarse screen or some bars over the pipe opening, but not so fine that they're likely to freeze.There is another style, called a "concentric vent", that has one pipe running inside the other, so you only need one hole in the wall. 

Here is an example from our rental agreement.STORAGE.Tenant agrees to not store items outside the dwelling unit unless contained in a proper storage unit.Tenant agrees to not pile or lean items against the building siding and fences.Tenant agrees to not store flammable liquids on the premises unless they are in small quantity for personal use only, stored according to manufacturer instructions and properly labeled.Tenant agrees to not store items that are excessively odorous.Tenant agrees to keep doors to storage sheds closed.

Here in Houston on MLS modular homes are classified as "manufactured," which is the same classification that trailers get.

Statutory Exemption from Fair Housing Act Liability for Exclusion Because of Illegal Manufacture or Distribution of a Controlled Substance Section 807(b)(4) of the Fair Housing Act provides that the Act does not prohibit “conduct against a person because such person has been convicted … of the illegal manufacture or distribution of a controlled substance as defined in section 102 of the Controlled Substances Act (21 U.S.C. 802).”37 Accordingly, a housing provider will not be liable under the Act for excluding individuals because they have been convicted of one or more of the specified drug crimes, regardless of any discriminatory effect that may result from such a policy.

My experience has been that a company will either manufacture their own cabinets, assemble kits from other manufacturers, or import kits from IKEA or China.

I know there's a big manufacturer of windows  in Venice Fl.

I’ve designed, manufactured, written scheduled maintenance procedures both at the OEM and field service level.

I realize that it is a step above, but as has been stated before, many areas have restrictions against manufactured housing.

The employment is an interesting scenario with many people working across the border in Mexico in many of our manufacturing plants that have gone that direction.

“Drug-related illegal activity” means the illegal manufacture, sale, distribution, purchase, USE, or possession with intent to manufacture, sell distribute, or USE of a controlled substance (as defined in Section 102 or the Controlled Substance Act (21 U.S.C. 8002) or possession of drug paraphernalia.2.Resident, any member of the resident’s household or guest or other person under the resident’s control shall not engage in any act intended to facilitate illegal activity, including drug-related illegal activity, on or near the said premises.3.Resident or members of the household will not permit the dwelling to be used for, or to facilitate illegal activity, including drug-related illegal activity, regardless of whether the individual engaging in such activity is a member of the household.4.Resident or members of the household will not engage in the manufacture, sale or distribution of illegal drugs at any locations, whether on or near the dwelling unit premises, or otherwise.5.Resident, any members of the resident’s household, or a guest or other person under the resident’s control shall not engage in acts of violence, or threats of violence, including but not limited to the unlawful discharge of firearms, prostitution, criminal street gang activity, intimidation, or any other breach of the housing agreement that the other wise jeopardizes the health safety or welfare of the landlord, his agents, or tenants.6.VIOLATION OF THE ABOVE PROVISIONS SHALL BE A MATERIAL VIOLATION OF THE HOUSING AGREEMENT AND GOOD CAUSE FOR TEMINATION OF TENANCY.