RedNutt,
I'm not certain how big your 3 year old is but my 6 year old daughter sits in a "booster type" seat of sorts that can be used strictly as a booster using the stock buckles on either side or can be rigged to use the straps that come on the seat. I'll have to check the brand for you however we have used it in my truck with no problems using the stock straps to hold the child in. The straps go across her chest and waste at the perfect location due to the configuration of the seat.
My daughter is about average size for her age and with the passenger seat moved up slightly, she seems to have no problem and has never complained at all.
I will admit when I was shopping for the truck I brought the booster seat and the child and tried everything on for size before purchase.
I'll check the brand of the seat and repost later today.
LOL
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2001 ,2500 ST Light Driftwood QC,LB,ETH,6 speed,3. 54 LS, LT265/75R16, TrTGr, Smoothie, Step Sheilds, C. Crane Truck Antenna, Line-X bedliner and rocker panels.