Trevor's trailer into log farmhouse with clean landscape and new environment. 
Expended territory, helipad, gas station, garage, storage building with an armory and a cooking lab.

I placed bunch of parasols on the roof of the house only.  
So water doesn't leak down the ceiling inside the house when it rains.
However, most of the props are getting wet by default even though no rain comes down.
Also the doors are not functioning, so i did not save them as dynamic and left all doors open instead.

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Installation: 

You must have Scripthook V and Map Editor with all the requirements.
I have included Unlockobjects and MapEditor scripts files in the zip. 
Unzip downloaded folder and copy Unlockobjects and MapEditor into your Mod or main GtaV folder, 
then load the mod "trevor" with the map editor while in the game.

If you want to erase the washers and the matress rubbish in the front yard and in the garage:

OpenIV: " x64h - levels - gta5 - props - roadside - rubbish "  then delete the following; 

prop_homeless_matress_01.ydr
prop_rub_washer_01.ydr

(Back Up Original Files First!) 

If you want to remove all other rubbish inside the trailer and make it look nice, 
i also recommend you to download " https://www.gta5-mods.com/misc/trevors-new-trailer " by Ryan Apex

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Enjoy !