Does anyone have experience using a trailer frame as the base foundation for a movable coop? I want to build a large coop but make it easy or relatively easy to move around. Have a large tractor that will pull anything so that's not an issue. How much trouble is it to move the pen every time you move the coop if they are not attached? Anticipating housing for 20-25 girls and companion cockerel. Have looked at samples here and plans elsewhere, will probably end up with original design. Materials not an issue. Size and portability are. Thanks.