MAX tow capacity on most Diesel pushers is 10,000 lbs. With your requirements for what you intend to put in that stacker, I will bet you be way over 10,000 lbs. The capacity is determined in part to the HITCH capacity on the Rear of the Motorhome. You CAN beef up the motorhome hitch capacity, but make sure you get a certified welder and somebody that knows how to do it. Also, you will probably be way over the complete cargo carrying capacity since you have a full family and will probably fill up the lower storage bins and inside. You really need to measure your existing 5th wheel FULL and then remove the personal items and see how much your total payload is. Diesel Motorhomes do NOT have unlimited cargo capacity, tho some think they do. Doug