no prob. ive only got a little sec here so ill try to answer quick and follow up later, but yes you can fit 8 wheels on a one foot truck section. if you order the one foot kit in any wheel amount you get four .. one foot long trucks/rails.. each one foot long with whatever amount of wheels per corner on each truck/rail. that way you can make your dolly shorter than 4 feet, or longer than four feet. when ordering the 4' rails you get two 4' trucks with the amount of wheels per corner you order on each end of the 4' rails.. like shown in the very top and very bottom picture of the order page. they are better for doorway dollies because a standard "doorway dolly" would be four feet long by apx 28" wide. that way the rails run the full length ofthe dolly and offer extra support underneath in the middle , and make for a nice looking and overall stronger dolly. hope this helps.