It is difficult to provide definitive answers to general questions...light does not necessarily mean flimsy and heavy does not necessarily mean durable. We have found that the more time we spend in a particular unit, the larger we want it to be. Will a larger/longer fifth wheel be more challenging to maneuver? Probably. Since you are in the decision making mode, you might consider finding a fifth wheel that meets your needs and is one you like...then start a search for a truck capable of towing it. As azdryheat pointed out, your fifth wheel will have its own breaks and should be able to stop itself.