We installed a transfer flow 50 gallon auxiliary tank in the bed of our truck.
It’s great, all computer controlled, fill it and go.
With our 42’ fifth wheel no fun trying to get in and out of gas stations.
We installed it ourselves and was easy. Took our time and all together maybe 6 hours but hubby is picky and hide and took time to make it all clean looking.
Some people complain about loosing bedspace but we don’t carry anything in our bed besides the hitch and our truck is only used for towing so for us made no difference.
Also fits perfectly under the bed cover we use.