What recourse do I have If my lease does not have a Convenant of Quiet Enjoyment?

The covenant of quiet enjoyment is implied in all residential leases in the State of Nevada.  It does not necessarily require an express clause.  The purpose of the covenant of quiet enjoyment is to secure tenants against the acts or hindrances of landlords. The covenant of quiet enjoyment generally is interpreted to secure the Tenant against the acts or hindrances of the Landlord and thus requires that the Landlord refrain from voluntarily impairing the character and value of of the property. Therefore, to prove a sufficient issue for breach of the covenant of quiet enjoyment, the tenant needs provide evidence demonstrating constructive eviction; actual eviction is not required.  The key point in these standards however is that the covenant of quiet enjoyment is a covenant between Landlord and Tenant and requires a voluntary act.  The situation that you are articulating appears not to be a breach of quiet enjoyment by the Landlord but an active nuisance by the neighbor which you could seek to enjoin.  Furthermore the property ownership interest that you indicate appears to describe a manufactured home, which often is part of a park which has rules and regulations and a tribunal through which you could seek to enforce your neighbor's violations.