so the van we are about to buy has a custom made tool box on the back. My concern is that this alters the length and weight of the vehicle and also might alter the way the van handles on the road from a safety perspective. Also if the van hasn't been put through the pits after the modification I am worried that this would be grounds for the invalidation of insurance if there was an accident as the vans weight and length is different. We really like this van. We want to buy it. Am I being anal or is this a valid legal concern. We don't want to make a mistake. Jaycos website says they do not recommend adding any toolboxes as this alters weight and warranty is invalid. It's a 2008 and we are in WA