When I bought my P500 everything you needed (except) steering wheel was an "add on", Honda's P K website shows no accessories. So what, Honda won't sell you a roof? What am I missing. Second question, will a P K-3 Dlx fit on a 10' trailer, I know the spec say 116.8", but if you have after market tires, rear bumper, etc will the extra 3.2" be enough room?