%% 
%%  A DANTE-Edition example
%% 
%%  Example 05-02-1 on page 170.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{105.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\makeatletter
\newcommand*{\rtab}{%
  \@stopfield
  \ifnum \@curtab<\@hightab
    \global\advance\@curtab \@ne
  \else
    \@badtab
  \fi
  \@tempdima\dimen\@curtab
  \advance\@tempdima -\dimen\@curtabmar
  \advance\@tempdima -\wd\@curline
  \global\setbox\@curline\hbox{%
    \unhbox\@curline
    \hbox to \@tempdima{\unhbox\@curfield\hfil}%
  }%
  \@startfield
  \ignorespaces
}
\makeatother

% see preamble in example for \rtab

\begin{document}
\begin{tabbing}
blablabla \= \kill \\
blabla \dotfill \> blabla\\% no effect!
bla\hrulefill \> blabla    % no effect!
\end{tabbing}
\begin{tabbing}
blablabla \=\kill\\blabla\dotfill\rtab blabla\\bla\hrulefill\rtab blabla
\end{tabbing}
\makeatletter\let\@rtab\rtab\makeatother
\begin{tabbing}
blablabla \=\kill\\blabla\dotfill\> blabla\\bla\hrulefill\>blabla
\end{tabbing}
\end{document}