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Depends all on size of your truck. If the sub frame and/or box survives lifting an axle I would say you do not really need a 3 point suspension on yur sub frame/box. If you have something like LMTV size truck subframe and/or box is unlikely strong enough to lift an axle once you hit the end stops.

At low/normal road driving speeds the suspension is not working well as it is too easy for the chassis to torque. Causing lot of movement of the driver cab which is not very comfortable.

Not all trucks need a subframe. Likely @Victorian does not have one either on his Transit. And I have an inbetween solution with spring mounts (Isuzu NPS 7t chassis). My truck is not behaving very well with a 3 point subframe as the chassis is relatively light. All depends on weight of the...

The point of the sub frame is to provide a hinge and raise the box enough so it can move around (or the truck chassis torque freely underneath). It does eliminate all torsion intrduced by anything below the box (eg axles going over uneven terrain). But the box itself still needs to take up some...

It is normal the base frame itself without the box on top will display some torsion. This base frame steel structure by itselfhas no torsional stiffness properties whatsoever and it is also not required. This stiffness all needs to come from whatever you place on top.

I looked at this because I wanted to make a truck outside Canada then import. I am not Canadian, but like to travel in North America. I chose Canada as BC is one of very few places in the world you can have a vehicle registered and insured as a tourist. So now I made a box on an Isuzu chassis...

For 15 years and older: https://tc.canada.ca/en/road-transportation/importing-vehicle/importing-older-vehicles-canada Import from USA/Mexico: https://tc.canada.ca/en/road-transportation/importing-vehicle/importing-vehicle-united-states-mexico From countries other than Mexico...

I did a fair bit of research on this sort of thing. Apart from RHD issue as mentioned by @SkiFreak you will not be able to get it into Canada and get it registered. There's some exceptions when it is old (I believe >15 years). Most countries nowadays is very fussy with Diesel engines. For...

I believe main reason to do the springs is to avoid too high torsional stresses on your box. The heavier and longer the chassis the more relevant this point is. The chassis flex may also be an advantage at slow speed on rough terrain to keep wheels on the ground. To answer your question when...

Thanks @billiebob. Very useful explanation. I am considering buying a chassis in Canada, register in BC, ship to Malaysia in a container, do conversion to 4x4, add camper shell like on my profile photo, then send it back to Canada on a roro. So should be all legal/in the grey area you...

Hi John, Fantastic that EC are now including the Chevy/Isuzu in your CORE program. I am interested in that, but really only need a simple (lower budget) conversion. Something that would get me something like a stock NPS 75-155 in Australia (Isuzu brochure attached). I am sure your CORE...

I am making one and planning to send the box to Canada in a container and fit it on a new class 4 NPR or class 5 NQR chassis with gas engine. - One of my hesitations is the high cost of doing a simple conversion to 4x4 that I have seen so far - The Earthcruiser conversion will end up almost...

My build in progress on NPS chassis. I am in Malaysia. Some boxes storage still to be added underneath. Started off with FRP sandwichpanels and added the nose. The whole box can tilt for maintenance/reaching the engine. Planning to make 1 more and send it to North America (only the box) to fit...

I am trying to see whether I can make this a viable business. Making fully fitted out boxes overseas for F550/RAM5500 or Isuzu NPR/NPS & Fuso and deliver to US port. Would you be looking at a bare box or with everything in it?

That looks great. One of my reason for F550 chassis choice is that whole build still can keep reasonably low while having beds over the cab. I will be over 11' overall height though.

I found what I needed on https://fordbbas.com/vehicleModel/SuperDuty (see attachment for relevant pages). Suprising that the Ford dealers seem unaware that all this information is readily available for anyone. By my calculation for 2 lift scenarios: Wheel well depth meaning the distance the...

That's great info. Thanks. 4" lift sounds like a lot.

Yes. That's the plan. Definitely going for Gas engine.

That 19' was for the box only. WIth the truck included it will be around 27'

I am looking to make a Expedition camper inspired by Earthroamer without the cost of an Earthroamer and with added ability to store mountainbikes indoors (upright without wheels). I am thinking of a new or recent F550 4x4 chassis cab with gas engine, Supercab (the one in picture is standard...