I am not familiar with your particular set-up, but it is not unusual for the mileage to be lower when running propane. This is particularly true if yours is bi-fuel or basically a gasoline vehicle which has not had major modifications (compression ratio, timing, etc.) to take advantage of propane's characteristics.
I don't know what size tank would be legal there, but if you have a company who services propane lift trucks (as in a freight terminal), they could probably supply another tank and tell you what you could do.
I believe that the supplier for the fork lift trucks could probably give this guy strong enough tanks for the road. Frankly, if he needs to go through certification from all the government bodies, he can't afford to do this. Well, it sounds like he's not in "the land of the free", so maybe he could.
It seems the best bet is to find one locally- they cost so much to ship. I nearly ended up with a 120 gal for a song but didn't follow up. would rather have that than my 80. you can pick them up for cheap it seems...just gotta be on the lookout.
'77F1504x4, '75 f250crew4x4, '79 Bronco 429, '83 bronco, '72 Torino with 351cj, 70 1/2 falcon, 75 stangII. all projects, 2 on the road. One pissed off wife!
The largest tank you can legally mount on your truck is an ASME (and not DOT - lift truck) tank that can be securely bolted down onto your vehicle. Sleegers and Manchester commonly make bed-mounted tanks designed for full-size pickup trucks and the largest tanks made are the 20x60 (218L / 57.6 USG) and the 24x60 (310L / 81.9 USG). You will need to check the space between the cab and the wheelwheels on a crew cab as the 24x60 may be a tight fit.
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