For your tow question it comes down to a few things. 4 down is preferred and easier than a dolly. But it depends if the vehicle you want to tow can be towed 4 down. Check the manufacturer. Then you need to check the towing capacity of the motorhome you are looking at. There is hitch rating - which should be 5000 on the gassers you listed. Then there is the weight ratings of the coach itself. EVERY coach is different with respect it's weight and the weight it can tow. Weigh the coach like it's ready for travel (fully loaded)- this is your GVW (it's good to weigh because the stickers are not always accurate with respect to what it actually weighs - not to mention loaded) . Find your motorhome's GCWR or gross combined weight rating. This is the total amount of weight that your motorhome can transport. Subtract your GVW from your GCVW. The LESSER of this number or the hitch rating is what you can tow. Compare it to the weight of your tow vehicle. Since you are shopping and likely can't load it, you can get a general idea using the sticker GVW and add what you think will be the weight of your water, food, people lp, etc.