This could be caused by any number of factors. First, I'd check to make sure that your chassis manufacturer, Sleighliner, has the right shocks installed. I know there were some issues on some of the gasser sleighs, made by Workdeer, where the new upgraded shock took care of that. The only place your sleigh should be porpoising is on low level deliveries to the Caribbean islands.
Another possibility is that the rear reindeer on the left side might be getting frightened. If he turns around and sees "Cat" on your valve cover, that could cause him to jump out and panic. In that case I'd check with Henderson Alignment and see if they have Safety-Blinders available for your model of reindeer.
Also, weight distribution can be a factor. If you place all the "lumps of coal" (for the naughty kids) on the same side you could have a weight imbalance, especially if the other side of the sleigh contains "Merty Christmas" helium balloons.
And lastly, but most importantly, have your sleigh weighed on a 4 point scale. You don't have Michelin XRVs on those reindeer do you?
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