The most recent TAR was shot and will air in SD.
As far as camera weight is concerned, A Panasonic (Standard Def.) SDX 900 body weighs 8.6lbs compared to its HD Version, the HDX 900 at 9.9lbs.
Sony’s (Standard Def.) PDW-530 weights 9lbs, compared to the HD Version, PDW-355 at 8.6lbs.
These are 4 of the most common cameras used in Reality TV. Weight is not an issue.