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The problem with van based vehicles is that van chassis arn't heavy like lorry chassis, and don't have good rustproofing finishes because in general vans are designed for a short high mileage life, so the wise brand new motorhome buyer gets them professionally rustproofed when new, and it's a mere fraction of the high cost of these vehicles then.
A good welder should be able to sort this out properly, albeit at some time and cost, but it will be easier if the vehicle was originally based on a chassis cab (where the vehicle started life with an open chassis from the driver's seat back and not based on an integral chassis van where the floorpan would have been part of the top of the chassis..
...indeed some makes/models of motorhome the vehicle maker only supplied the cab with no back panel and two chassis rails sticking out just behind the driver's seat, often these cabs were bolted together back to back like a push me pull you and the motorhome company supplied their chassis as well as built the body, anecdotally these were 'interesting' to deliver on a transporter because there was no parking brake fitted (no back axle), and yes PSA supplied lots of these.
This is only my opinion here, most good vehicle refurb welders i've known are welders and general mechanics, they are not rustproofing experts and their method will basically be to coat everything in waxoyl after welding up, so it might be sensible to get the welding done first and only painted over with base undercoat, then MOT'd, and then to get a pro rustproofer to perform their magic on the whole of the undersides, paying particular attention to the newly welded sections inside and out, you can do this yourself of course with some of the better DIY rustproofing products now on the market.
Edited by gordonbennet on 09/03/2019 at 09:43
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