Since you provided an extensive list of documents, all from the same source, I will produce short analysis for each one. In the analysis I will consider the review presented with the documents as part of the evidence. Therefore I will address not only the document, but as well the allegation of a mass extermination plan executed by the Third Reich.
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Analysis of the Presented Evidence
Introduction
Evidence
A scanned document presented in the review "...special vans...or other remedies...” in The Holocaust History internet page. [1]
Claim
The internet page reviewer uses the document to prove that vehicles equipped with a gas chamber were part of a supposed mass extermination plan performed by the Germans during the Second World War. To support the claim, the reviewer argues that steel bottles containing carbon monoxide were employed to poison people locked inside the vehicle gas chamber. [2]
Source
The document is a copy of the original document provided by the Bundesarchiv Koblenz [3] archive.
Language
German is the only applied language in the document. The document reviewer uses a translation made by Gord McFee exclusively for The Holocaust History internet page. [4]
Format
Letter produced by a mechanical typing machine with presence of handwriting notes and signatures. [5]
Samples
1.
2.
3.
Examination
1. Sending office code in the top right corner is not complete (sample 1).
2. Letter serial number in the top right corner is identified with handwriting (sample 1).
3. Date typed in the top left corner is not completely specified (sample 1).
4. Wrong translation of the word “Sonderwager” presented in the Gord McFee translation (sample 2) [6]
5. Wrong translation of the word “Hilfsmitteln” presented in the Gord McFee translation (sample 3) [7]
6. The paragraph starting with “2)” was inserted after the original letter was finished (sample 3):
a. Slight rotation of the paragraph line when compared with the previous part of the letter.
b. The paragraph is overwriting the original abbreviation "I.A." used in the end of the letter. [8]
7. Officer “Pradel” rank is wrongly identified as “Major” (sample 3). [9]
Interpretation
In view of the examination 1, 2, 3 and 7, the letter cannot be considered as legitimate proof of identification. Lack of the necessary information which serves exclusively to identify the letter characteristics is fundamental to cross the relevant information with other evidences. Therefore the letter cannot prove the involvement of the officers “Rauf” and “Pradel” with the alleged claim.
The examination 4 and 5 shows an attempt to force the reader to follow a pre-defined logic when evaluating the review. The reviewer carefully selected the two word title from the misinterpreted words: "...special vans...or other remedies...”
From the examination 6a, 6b and 7, is possible to conclude that the paragraph starting with “2)” was deliberately inserted to link the name “Prade” with the presumed sender “Raulf”.
The letter translation does not support the reviewer claim, except by the citation of “steel bottles with carbon monoxide”, whose purpose is not clearly defined by the letter context.
Conclusion
The analysed document is forged and was misinterpreted from a biased translation to prove the claim.
Notes:
[1] March 26, 1942: "Special Vans...or Other Remedies". http://holocaust-history.org/
[2] Letter from Rauff to the Criminal Technical Institute, stating that "special vans" are needed at the Mauthausen concentration camp. Until they arrive, bottled poison gas must be used.
[3] http://www.bundesarchiv.de
[4] The translation above is by Holocaust History Project volunteer Gord McFee. http://holocaust-history.org/19420326-rauff-sonderwagen/
[5] http://holocaust-history.org/19420326-rauff-sonderwagen/p1.jpg
[6] Google Translate: aids, tools, auxiliaries, auxiliary, assistant. http://translate.google.com/#de|en|Hilfsmitteln
[7] Google Translate: special or specific + car, wagons, trolley, cart. http://translate.google.com/#de|en|Sonderwagen
[8] IA - im Auftrag, "i.A." http://www.chemie.fu-berlin.de/cgi-bin/acronym?i.a.
[9] II. D 3 a Kraftfahrwesen der Sipo (SS-Hauptsturmführer und Hauptmann der Schutzpolizei Friedrich Pradel) http://www.drittesreich.wz.cz/organizace/ss/deleni_ss/allgemeine_ss/rsha/rsha.html