I have a mobile home, Its a 05 model so its floors should be stronger then older models. I have 150g with a 20g protein skimmer/ UV sump, 29g fuge on a double stand next to the tank and a 30g Rubbermaid tub under the tank for the return. All in all 1800lbs. What I did is place the tank 1' from the outside wall. Parallel with the trailer so I went across the wood beams. Also it crosses 2 large outriggers from the main beam in the middle to the sides. Then I installed concrete block pillars under each wood beam in between the two outrigger, the wood beams are abut 16" apart so I only needed a total of 3. This way each wood beam was either supported by the metal outriggers or the pillar. All of this came from advice and consultation from the manufacture. The working load per sq foot was 440lbs, he didn’t want to tell me the breaking load weight, but from my experience and knowledge working load is half if not more then half of the breaking load = 880lbs. My tank weighs no more 2000lbs with me around working on it, and the tank is 1.5x6 then another 1.5x2 for the sumps. so even without the extra support I could be ok. So I would recommend for you, if your worried place the tank over 2 outriggers and if you want support one of the woods beams in the middle or one side(if you can only place the tank over one outrigger).