Nice video! I might get one of the cats to ride but I'd have to put a cardboard box on the trailer for them to ride in! There are empty boxes in various places around the house if you don't throw them away as soon as you take stuff out they fill up with a cat.
I bought F350 add on leaves from TamiyaUSA, 4 different lengths, in packs of 4 for about $4-6 a pack. Put them in the front and rear.